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Stockholders' Equity (Details) - USD ($)
3 Months Ended
Jun. 09, 2021
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Dec. 28, 2022
Dec. 14, 2022
May 17, 2022
Mar. 21, 2022
Sep. 15, 2020
Aug. 14, 2020
May 29, 2019
Dec. 04, 2018
Jan. 13, 2015
Stockholders' Equity (Details) [Line Items]                          
Common stock, par value $ 0.01                        
Exercise price per unit   $ 0.25                      
Fair value of stock options granted (in Dollars)     $ 209,000                    
Unrecognized compensation cost (in Dollars)   $ 434,000                      
Warrants termination, description   An Amendment No. 2 to the Prospectus Supplement (as described below) was filed on October 12, 2017.                       
Price per share   $ 5                      
Common stock, par value   $ 0.01   $ 0.01                  
Offering cost, description   The unit offering consisted of Units of the Company’s securities where each Unit (priced at $250.00 each) was comprised of (i) two hundred and fifty (250) shares of Common Stock and (ii) Common Stock purchase warrants to purchase an additional fifty (50) shares of Common Stock at a per share exercise price of $2.00. The investor’s Plan account was credited with the number of shares of the Company’s Common Stock and Warrants acquired under the Units purchased. For Plan participants who enrolled into the Unit Program with the purchase of at least one Unit and also enrolled in the separate Automatic Monthly Investments (“AMI”) program at a minimum of $50.00 per month or more, received an additional twenty-five (25) warrants at an exercise price of $2.00 during this Unit Option Program. The twenty-five (25) additional warrants were for enrolling into the AMI program. Existing subscribers to the AMI were entitled to the additional twenty-five (25) warrants once, if they purchased at least one (1) unit during the Unit program. Each warrant affords the participant the opportunity to purchase one share of our Common Stock at a warrant exercise price of $2.00. The warrant is referred to as “ZNWAL.                      
Raised amount (in Dollars)   $ 792,000 11,427,000                    
Common Stock [Member]                          
Stockholders' Equity (Details) [Line Items]                          
Exercise price per unit                         $ 1
Share issued (in Shares)                         1
Two Zero Two One Omnibus Incentive Stock Option Plan [Member]                          
Stockholders' Equity (Details) [Line Items]                          
Shares of common stock (in Shares) 38,000,000                        
Exercisable period 10 years                        
Dividend Reinvestment and Stock Purchase Plan [Member]                          
Stockholders' Equity (Details) [Line Items]                          
Warrants termination, description   The ZNWAB warrants first became exercisable on May 2, 2016 and, in the case of ZNWAC on May 2, 2017 and in the case of ZNWAD on May 2, 2018, at a per share exercise price of $1.00.                       
ZNWAB warrants [Member]                          
Stockholders' Equity (Details) [Line Items]                          
Warrants termination, description   As of May 2, 2017, any outstanding ZNWAB warrants expired.                       
ZNWAC warrants [Member]                          
Stockholders' Equity (Details) [Line Items]                          
Warrants termination, description   As of May 2, 2018, any outstanding ZNWAC warrants expired.                       
ZNWAD Warrants [Member]                          
Stockholders' Equity (Details) [Line Items]                          
Expiration date, description   On May 29, 2019, the Company extended the termination date of the ZNWAD Warrant by one (1) year from the expiration date of May 2, 2020 to May 2, 2021. Zion considers this warrant as permanent equity per ASC 815-40-35-2. As such, there is no value assigned to this extension. On September 15, 2020, the Company extended the termination date of the ZNWAD Warrant by two (2) years from the expiration date of May 2, 2021 to May 2, 2023. Zion considers this warrant as permanent equity per ASC 815-40-35-2. As such, there is no value assigned to this extension.                       
ZNWAE warrants [Member]                          
Stockholders' Equity (Details) [Line Items]                          
Warrants termination, description   The ZNWAE warrants became exercisable on May 1, 2017 and continued to be exercisable through May 1, 2020 at a per share exercise price of $1.00.                       
Expiration date, description   On May 29, 2019, the Company extended the termination date of the ZNWAE Warrant by one (1) year from the expiration date of May 1, 2020 to May 1, 2021. Zion considers this warrant as permanent equity per ASC 815-40-35-2. As such, there is no value assigned to this extension. On September 15, 2020, the Company extended the termination date of the ZNWAE Warrant by two (2) years from the expiration date of May 1, 2021 to May 1, 2023. Zion considers this warrant as permanent equity per ASC 815-40-35-2. As such, there is no value assigned to this extension.                       
Warrant [Member]                          
Stockholders' Equity (Details) [Line Items]                          
Exercise price per unit                         $ 4
Share issued (in Shares)                         3
ZNWAE warrants [Member]                          
Stockholders' Equity (Details) [Line Items]                          
Expiration date, description   On November 1, 2016, the Company launched a unit offering under the Company’s DSPP pursuant to which participants could purchase units comprised of seven shares of Common Stock and seven Common Stock purchase warrants, at a per unit purchase price of $10. The warrant is referred to as “ZNWAE.” The ZNWAE warrants became exercisable on May 1, 2017 and continued to be exercisable through May 1, 2020 at a per share exercise price of $1.00.                       
Znwaf [Member]                          
Stockholders' Equity (Details) [Line Items]                          
Expiration date, description   On May 29, 2019, the Company extended the termination date of the ZNWAF Warrant by one (1) year from the expiration date of August 14, 2020 to August 14, 2021. Zion considers this warrant as permanent equity per ASC 815-40-35-2. As such, there is no value assigned to this extension. On September 15, 2020, the Company extended the termination date of the ZNWAF Warrant by two (2) years from the expiration date of August 14, 2021 to August 14, 2023. Zion considers this warrant as permanent equity per ASC 815-40-35-2. As such, there is no value assigned to this extension.                       
Common stock, par value   $ 5                      
ZNWAG [Member]                          
Stockholders' Equity (Details) [Line Items]                          
Offering cost, description   This unit offering enabled participants to purchase Units of the Company’s securities where each Unit (priced at $250.00 each) was comprised of (i) a certain number of shares of Common Stock determined by dividing $250.00 (the price of one Unit) by the average of the high and low sale prices of the Company’s Common Stock as reported on the NASDAQ on the unit purchase date and (ii) Common Stock purchase warrants to purchase an additional 15 shares of Common Stock at a warrant exercise price of $1.00 per share. The warrant is referred to as “ZNWAG.” The warrants became exercisable on January 8, 2018 and continue to be exercisable through January 8, 2024 at a revised per share exercise price of $.25. The warrant terms provide that if the Company’s Common Stock trades above $5.00 per share as the closing price for 15 consecutive trading days at any time prior to the expiration date of the warrant, the Company has the sole discretion to accelerate the termination date of the warrant upon providing 60 days advanced notice to the warrant holders. On December 14, 2022, the Company extended the termination date of the ZNWAG warrant by one (1) year from the expiration date of January 8, 2023 to January 8, 2024. Zion considers this warrant as permanent equity per ASC 815-40-35-2. As such, there is no value assigned to this extension. On February 1, 2018, the Company launched another unit offering which terminated on February 28, 2018. The unit offering consisted of Units of our securities where each Unit (priced at $250.00 each) was comprised of (i) 50 shares of Common Stock and (ii) Common Stock purchase warrants to purchase an additional 50 shares of Common Stock. The investor’s Plan account was credited with the number of shares of the Company’s Common Stock acquired under the Units purchased. Each warrant affords the investor the opportunity to purchase one share of Company Common Stock at a warrant exercise price of $5.00. The warrant is referred to as “ZNWAH.” The warrants became exercisable on April 2, 2018 and continued to be exercisable through April 2, 2020 at a per share exercise price of $5.00, after the Company, on December 4, 2018, extended the termination date of the Warrant by one (1) year from the expiration date of April 2, 2019 to April 2, 2020. On May 29, 2019, the Company extended the termination date of the ZNWAH Warrant by one (1) year from the expiration date of April 2, 2020 to April 2, 2021. Zion considers this warrant as permanent equity per ASC 815-40-35-2. As such, there is no value assigned to this extension. On September 15, 2020, the Company extended the termination date of the ZNWAH Warrant by two (2) years from the expiration date of April 2, 2021 to April 2, 2023. Zion considers this warrant as permanent equity per ASC 815-40-35-2. As such, there is no value assigned to this extension. On August 21, 2018, the Company initiated another unit offering, and it terminated on September 26, 2018. The offering consisted of Units of the Company’s securities where each Unit (priced at $250.00 each) was comprised of (i) a certain number of shares of Common Stock determined by dividing $250.00 (the price of one Unit) by the average of the high and low sale prices of the Company’s publicly traded common stock as reported on the NASDAQ on the Unit Purchase Date and (ii) Common Stock purchase warrants to purchase an additional twenty-five (25) shares of Common Stock. The investor’s Plan account was credited with the number of shares of the Company’s Common Stock acquired under the Units purchased. Each warrant affords the investor the opportunity to purchase one share of Company Common Stock at a warrant exercise price of $1.00. The warrant is referred to as “ZNWAJ.” The warrants became exercisable on October 29, 2018 and continued to be exercisable through October 29, 2020 at a per share exercise price of $1.00, after the Company, on December 4, 2018, extended the termination date of the Warrant by one (1) year from the expiration date of October 29, 2019 to October 29, 2020. On May 29, 2019, the Company extended the termination date of the ZNWAJ Warrant by one (1) year from the expiration date of October 29, 2020 to October 29, 2021. Zion considers this warrant as permanent equity per ASC 815-40-35-2. As such, there is no value assigned to this extension. On September 15, 2020, the Company extended the termination date of the ZNWAJ Warrant by two (2) years from the expiration date of October 29, 2021 to October 29, 2023.                      
ZNHAH [Member]                          
Stockholders' Equity (Details) [Line Items]                          
Expiration date, description   The warrants became exercisable on August 26, 2019 and continued to be exercisable through August 26, 2021 at a per share exercise price of $2.00. On September 15, 2020, the Company extended the termination date of the ZNWAL Warrant by two (2) years from the expiration date of August 26, 2021 to August 26, 2023. Zion considers this warrant as permanent equity per ASC 815-40-35-2. As such, there is no value assigned to this extension. Under our Plan, the Company under a Request For Waiver Program executed Waiver Term Sheets of a unit option program consisting of a Unit (shares of stock and warrants) of its securities and subsequently an option program consisting of shares of stock to a participant. The participant’s Plan account was credited with the number of shares of the Company’s Common Stock and warrants that were acquired. Each warrant affords the participant the opportunity to purchase one share of our Common Stock at a warrant exercise price of $1.00. The warrant shall have the company notation of “ZNWAM.” The warrants will not be registered for trading on the OTCQX or any other stock market or trading market. The warrants became exercisable on January 15, 2021 and continue to be exercisable through July 15, 2023 at a revised per share exercise price of $.05. On March 21, 2022, the Company extended the termination date of the ZNWAM warrant by one (1) year from the expiration date of July 15, 2022 to July 15, 2023 and revised the exercise price to $0.05. Zion considers this warrant as permanent equity per ASC 815-40-35-2. As such, there is no value assigned to this extension. On February 1, 2021, the Company initiated a unit offering and it terminated on March 17, 2021. The unit offering consisted of Units of the Company’s securities where each Unit (priced at $250.00 each) was comprised of (i) the number of Common Stock shares represented by the high-low average on the purchase date and (ii) Common Stock purchase warrants to purchase an additional twenty-five (25) shares of Common Stock at a per share exercise price of $1.00. The investor’s Plan account was credited with the number of shares of the Company’s Common Stock and Warrants acquired under the Units purchased. For Plan participants who enrolled into the Unit Program with the purchase of at least one Unit or who enrolled in the separate Automatic Monthly Investments (“AMI”) program at a minimum of $50.00 per month or more, received an additional ten (10) warrants at an exercise price of $1.00 during this Unit Option Program. The ten (10) additional warrants were for enrolling into the AMI program. Existing subscribers to the AMI were also entitled to the additional ten (10) warrants once, provided that they purchased at least one (1) unit during the Unit program. Each warrant affords the participant the opportunity to purchase one share of our Common Stock at a warrant exercise price of $1.00. The warrant is referred to as “ZNWAN.” The warrants became exercisable on May 16, 2021 and continue to be exercisable through May 16, 2023 at a per share exercise price of $1.00. On April 12, 2021, the Company initiated a unit offering and it terminated on May 12, 2021. The unit offering consisted of Units of the Company’s securities where each Unit (priced at $250.00 each) was comprised of (i) the number of Common Stock shares represented by the high-low average on the purchase date and (ii) Common Stock purchase warrants to purchase an additional fifty (50) shares of Common Stock at a per share exercise price of $.25. The investor’s Plan account was credited with the number of shares of the Company’s Common Stock and Warrants acquired under the Units purchased. For Plan participants who enrolled into the unit offering with the purchase of at least one Unit or who enrolled in the separate Automatic Monthly Investments (“AMI”) program at a minimum of $50.00 per month or more, received an additional fifty (50) warrants at an exercise price of $.25 during this Unit Option Program. The fifty (50) additional warrants were for enrolling into the AMI program. Existing subscribers to the AMI were also entitled to the additional fifty (50) warrants once, provided that they purchased at least one (1) unit during the Unit program. Each warrant affords the participant the opportunity to purchase one share of our Common Stock at a warrant exercise price of $.25. The warrant is referred to as “ZNWAO.” The warrants became exercisable on June 12, 2021 and continue to be exercisable through June 12, 2023 at a per share exercise price of $.25. Under our Plan, the Company under a Request For Waiver Program executed a Waiver Term Sheet for a unit program consisting of a Unit (shares of stock and warrants) to a participant. After conclusion of the program on May 28, 2021, the participant’s Plan account was credited with the number of shares of the Company’s Common Stock and Warrants that were acquired. Each warrant affords the participant the opportunity to purchase one share of our Common Stock at a warrant exercise price of $.25. The warrant has the company notation of “ZNWAP.” The warrants will not be registered for trading on the OTCQX or any other stock market or trading market. The warrants were issued and became exercisable on June 2, 2021 and continue to be exercisable through June 2, 2022 at a per share exercise price of $.25. On March 21, 2022, the Company extended the termination date of the ZNWAP Warrant by one (1) year from the expiration date of June 2, 2022 to June 2, 2023. Zion considers this warrant as permanent equity per ASC 815-40-35-2. As such, there is no value assigned to this extension. Under our Plan, the Company under a Request For Waiver Program executed a Waiver Term Sheet for a program consisting of Zion securities to a participant. After conclusion of the program on June 17, 2021, the participant’s Plan account was credited with the number of shares of the Company’s Common Stock that were acquired.  Under our Plan, the Company under a Request For Waiver Program executed a Waiver Term Sheet of a unit program consisting of units of shares of stock and warrants to a participant. After conclusion of the program on June 18, 2021, the participant’s Plan account was credited with the number of shares of the Company’s Common Stock and warrants that were acquired. Each warrant affords the participant the opportunity to purchase one share of our Common Stock at a warrant exercise price of $.25. The warrant shall have the company notation of “ZNWAQ.” The warrants will not be registered for trading on the OTCQX or any other stock market or trading market. The warrants were issued on May 5, 2022 and are exercisable through July 6, 2023 at a revised per share exercise price of $.05. Zion considers this warrant as permanent equity per ASC 815-40-35-2. As such, there is no value assigned to this extension. Under our Plan, the Company under a Request For Waiver Program executed a Waiver Term Sheet of a unit program consisting of units of shares of stock and warrants to a participant. After conclusion of the program on June 18, 2021, the participant’s Plan account was credited with the number of shares of the Company’s Common Stock and Warrants that were acquired. Each warrant affords the participant the opportunity to purchase one share of our Common Stock at a warrant exercise price of $.25. The warrant shall have the company notation of “ZNWAR.” The warrants will not be registered for trading on the OTCQX or any other stock market or trading market. The warrants were issued and became exercisable on June 22, 2021 and continue to be exercisable through June 22, 2022 at a per share exercise price of $.25. Additionally, Zion incurred $115,000 in equity issuance costs to an outside party related to this waiver program. On March 21, 2022, the Company extended the termination date of the ZNWAR Warrant by one (1) year from the expiration date of June 22, 2022 to June 22, 2023. Zion considers this warrant as permanent equity per ASC 815-40-35-2. As such, there is no value assigned to this extension. Under our Plan, the Company under a Request For Waiver Program executed a Waiver Term Sheet to a participant. After conclusion of the program on September 15, 2021, the participant’s Plan account was credited with the number of shares of the Company’s Common Stock that were acquired. Under our Plan, the Company under a Request For Waiver Program executed a Waiver Term Sheet of a unit program consisting of units of shares of stock and warrants to a participant. After conclusion of the program on November 15, 2021, the participant’s Plan account was credited with the number of shares of the Company’s Common Stock and warrants that will be acquired. Each warrant affords the participant the opportunity to purchase one share of our Common Stock at a warrant exercise price of $1.00. The warrant shall have the company notation of “ZNWAS.” The warrants will not be registered for trading on the OTCQX or any other stock market or trading market. The warrants will be issued and become exercisable on November 15, 2025 and continue to be exercisable through December 31, 2025 at a revised per share exercise price of $.25. On December 9, 2019 Zion filed an Amendment No. 1 to the Registration Statement on Form S-1 (File No. 333-235299) solely for the purpose of re-filing a revised Exhibit 5.1 to the Registration Statement. This Amendment No. 1 does not modify any provision of the prospectus that forms a part of the Registration Statement and accordingly, such prospectus has not been included herein. On December 10, 2021 Zion filed an Amendment No. 1 to the Registration Statement on Form S-3 (File No. 333-235299) for the purpose of converting the existing Form S-1 to the Registration Statement on Form S-3. This Amendment No. 1 does not modify any provision of the prospectus that forms a part of the Registration Statement and accordingly such prospectus has not been included herein. Under our Plan, the Company under a Request For Waiver Program executed a Waiver Term Sheet of a unit program consisting of units of shares of stock and warrants to a participant. After conclusion of the program on September 30, 2022, the participant’s Plan account was credited with the number of shares of the Company’s Common Stock and Warrants that were acquired. Each warrant affords the participant the opportunity to purchase one share of our Common Stock at a warrant exercise price of $.25. The warrant shall have the company notation of “ZNWAT.” The warrants will not be registered for trading on the OTCQX or any other stock market or trading market. The warrants will be issued and become exercisable on November 15, 2025 and continue to be exercisable through December 31, 2025 at a per share exercise price of $.25. Under our Plan, the Company under a Request For Waiver Program executed a Waiver Term Sheet of a unit program consisting of units of shares of stock and warrants to a participant. After conclusion of the program on December 31, 2022, the participant’s Plan account was credited with the number of shares of the Company’s Common Stock and Warrants that were acquired. Each warrant affords the participant the opportunity to purchase one share of our Common Stock at a warrant exercise price of $.25. The warrant shall have the company notation of “ZNWAU.” The warrants will not be registered for trading on the OTCQX or any other stock market or trading market. The warrants will be issued and become exercisable on November 15, 2025 and continue to be exercisable through December 31, 2025 at a per share exercise price of $.25. Under our Plan, the Company under a Request For Waiver Program executed a Waiver Term Sheet of a program consisting of shares of stock to a participant. After conclusion of the program on June 16, 2023, the participant’s Plan account will be credited with the number of shares of the Company’s Common Stock that will be acquired. On March 13, 2023, Zion filed with the Securities and Exchange Commission an Amendment No. 2 to the Prospectus Supplement dated as of December 15, 2021 and accompanying base prospectus dated December 1, 2021 relating to the Company’s Dividend Reinvestment and Direct Stock Purchase Plan. This Amendment No. 2 to Prospectus Supplement amends the Prospectus Supplement. The Prospectus forms a part of the Company’s Registration Statement on Form S-3 (File No. 333-261452), as amended, which was declared effective by the SEC on December 15, 2021. Amendment No. 2 - New Unit Option under the Unit Program Under our Plan, we provided a Unit Option under Amendment No. 2. Our Unit Program consisted of the combination of Common Stock and warrants with basic Unit Program features, conditions and terms outlined in the Original Prospectus Supplement and Amendment No. 1. Amendment No. 2 provided the option period, unit price and the determination of the number of shares of Common Stock and warrants per unit. This Unit Option had up to three tranches of investment, in which the second and third tranches were each subject to termination upon a total of $7,500,000 received from participants by the Company during the first or second tranche. The first tranche period began on March 13, 2023 and terminated on March 26, 2023. The second tranche began on March 27, 2023 and terminated on April 9, 2023 and the third tranche began on April 10, 2023 and terminated on April 27, 2023. The Unit Option consisted of Units of our securities where each Unit (priced at $250.00 each) was comprised of (i) a certain number of shares of Common Stock determined by dividing $250.00 (the price of one Unit) by the average of the high and low sale prices of the Company’s publicly traded common stock as reported on the OTCQX on the Unit Purchase Date and (ii) Common Stock purchase warrants to purchase an additional five hundred (500) shares of Common Stock at a per share exercise price of $0.05. The participant’s Plan account was credited with the number of shares of the Company’s Common Stock and Warrants that were acquired under the Units purchased. Each warrant affords the participant the opportunity to purchase one share of our Common Stock at a warrant exercise price of $0.05. The warrant shall have the Company notation of “ZNWAV” under the first tranche, “ZNWAW” under the second tranche and “ZNWAX” under the third tranche. The warrants will not be registered for trading on the OTCQX or any other stock market or trading market. Plan participants, who enrolled into the Unit Program with the purchase of at least one Unit and enrolled in the separate Automatic Monthly Investments (“AMI”) program at a minimum of $50.00 per month, received an additional fifty (50) warrants at an exercise price of $0.05 during this Unit Option Program. The fifty (50) additional warrants were for enrolling into the AMI program and shall have the Company notation of “ZNWAY.” Existing subscribers to the AMI are entitled to the additional fifty (50) warrants, if they purchase at least one (1) Unit during the Unit program. Plan participants, who enroll in the AMI at a minimum of $100 per month, will receive one hundred (100) ZNWAY warrants. Plan participants, who enroll in the AMI at a minimum of $250 per month, will receive two hundred and fifty (250) ZNWAY warrants. Plan participants, who enroll in the AMI at a minimum of $500 per month, will receive five hundred (500) ZNWAY warrants. The AMI program requires 90 days of participation to receive the ZNWAY warrants. Existing AMI participants are entitled to participate in this monthly program by increasing their monthly amount above the minimum $50.00 per month. The ZNWAV warrants became exercisable on March 31, 2023 and continue to be exercisable through June 28, 2023 at a per share exercise price of $0.05. The ZNWAW warrants became exercisable on April 14, 2023 and continue to be exercisable through July 13, 2023 at a per share exercise price of $0.05. The ZNWAX warrants became exercisable on May 2, 2023 and continue to be exercisable through July 31, 2023 at a per share exercise price of $0.05. The ZNWAY warrants will become exercisable on June 12, 2023 and will continue to be exercisable through September 10, 2023 at a per share exercise price of $0.05. For the three months ended March 31, 2023, and 2022, approximately $792,000 and $11,427,000 were raised under the DSPP program, respectively. The company raised approximately $761,000 from the period April 1, 2023 through May 9, 2023, under the DSPP program. The warrants represented by the company notation ZNWAA are tradeable on the OTCQX market under the symbol ZNOGW. However, all of the other warrants characterized above, in the table below, and throughout this Form 10-Q, are not tradeable and are used internally for classification and accounting purposes only.                       
Warrant [Member]                          
Stockholders' Equity (Details) [Line Items]                          
Exercise price per unit         $ 0.05                
Expiration term           1 year 1 year 1 year 2 years   1 year 1 year  
Six Senior Officers [Member] | 2011 Equity Incentive Stock Option Plan [Member]                          
Stockholders' Equity (Details) [Line Items]                          
Shares purchased under option plan (in Shares)   175,000                      
Exercise price per unit   $ 0.0615                      
Stock option plan, expiration date   January 4, 2032                      
Fair value of stock options granted (in Dollars)   $ 29,000                      
One Staff [Member] | Two Zero Two One Omnibus Incentive Stock Option Plan [Member]                          
Stockholders' Equity (Details) [Line Items]                          
Stock option plan, expiration date   vested upon grant and are exercisable through January 4, 2033                      
One senior officer [Member] | 2011 Equity Incentive Stock Option Plan [Member]                          
Stockholders' Equity (Details) [Line Items]                          
Exercise price per unit   $ 0.01                      
Fair value of stock options granted (in Dollars)   $ 9,000                      
Shares purchased under option plan (in Shares)   25,000                      
Six Senior Officers One [Member] | Two Zero Two One Omnibus Incentive Stock Option Plan [Member]                          
Stockholders' Equity (Details) [Line Items]                          
Fair value of stock options granted (in Dollars)   $ 22,000                      
Option to purchase shares of common stock (in Shares)   175,000                      
Exercise price per share   $ 0.1529                      
Six Senior Officers One [Member] | 2011 Equity Incentive Stock Option Plan [Member]                          
Stockholders' Equity (Details) [Line Items]                          
Shares purchased under option plan (in Shares)   1,600,000                      
Exercise price per unit   $ 0.1529                      
Fair value of stock options granted (in Dollars)   $ 1,500                      
One Senior Officers [Member] | 2011 Equity Incentive Stock Option Plan [Member]                          
Stockholders' Equity (Details) [Line Items]                          
Shares purchased under option plan (in Shares)   25,000                      
Exercise price per unit   $ 0.01                      
One Senior Officer [Member] | Two Zero Two One Omnibus Incentive Stock Option Plan [Member]                          
Stockholders' Equity (Details) [Line Items]                          
Fair value of stock options granted (in Dollars)   $ 4,000                      
one senior officer and one staff [Member] | Two Zero Two One Omnibus Incentive Stock Option Plan [Member]                          
Stockholders' Equity (Details) [Line Items]                          
Fair value of stock options granted (in Dollars)   $ 39,000                      
Option to purchase shares of common stock (in Shares)   300,000                      
Exercise price per share   $ 0.01                      
One Board [Member] | Two Zero Two One Omnibus Incentive Stock Option Plan [Member]                          
Stockholders' Equity (Details) [Line Items]                          
Option to purchase shares of common stock (in Shares)   200,000                      
Exercise price per share   $ 0.01                      
Five Senior Officers [Member] | Two Zero Two One Omnibus Incentive Stock Option Plan [Member]                          
Stockholders' Equity (Details) [Line Items]                          
Fair value of stock options granted (in Dollars)   $ 209,000                      
Seven Board [Member] | Two Zero Two One Omnibus Incentive Stock Option Plan [Member]                          
Stockholders' Equity (Details) [Line Items]                          
Fair value of stock options granted (in Dollars)   $ 182,000                      
Seven Board [Member] | 2011 Non-Employee Directors Stock Option Plan [Member]                          
Stockholders' Equity (Details) [Line Items]                          
Shares purchased under option plan (in Shares)   1,400,000                      
Exercise price per unit   $ 0.1529                      
Board [Member]                          
Stockholders' Equity (Details) [Line Items]                          
Fair value of stock options granted (in Dollars)     182,000                    
Four Staff [Member] | Two Zero Two One Omnibus Incentive Stock Option Plan [Member]                          
Stockholders' Equity (Details) [Line Items]                          
Fair value of stock options granted (in Dollars)   $ 23,000                      
Option to purchase shares of common stock (in Shares)   160,000                      
Exercise price per share   $ 0.01                      
Seven Staff [Member] | Two Zero Two One Omnibus Incentive Stock Option Plan [Member]                          
Stockholders' Equity (Details) [Line Items]                          
Stock option plan, expiration date   January 17, 2032                      
Six Staff [Member]                          
Stockholders' Equity (Details) [Line Items]                          
Fair value of stock options granted (in Dollars)     26,000                    
Six Staff [Member] | Two Zero Two One Omnibus Incentive Stock Option Plan [Member]                          
Stockholders' Equity (Details) [Line Items]                          
Fair value of stock options granted (in Dollars)   $ 26,000                      
Option to purchase shares of common stock (in Shares)   200,000                      
Exercise price per share   $ 0.14                      
Two Consultants [Member] | Two Zero Two One Omnibus Incentive Stock Option Plan [Member]                          
Stockholders' Equity (Details) [Line Items]                          
Fair value of stock options granted (in Dollars)   $ 5,000                      
Option to purchase shares of common stock (in Shares)   40,000                      
Exercise price per share   $ 0.14                      
Two Zero Two One Omnibus Incentive Stock Option Plan [Member]                          
Stockholders' Equity (Details) [Line Items]                          
Fair value of stock options granted (in Dollars)     $ 5,000                    
New Unit Program [Member] | Znwaf [Member]                          
Stockholders' Equity (Details) [Line Items]                          
Exercise price per unit                   $ 1      
Unit Option Program [Member] | ZNWAK [Member]                          
Stockholders' Equity (Details) [Line Items]                          
Warrants termination, description   The offering consisted of Units of the Company’s securities where each Unit (priced at $250.00 each) is comprised of (i) two hundred and fifty (250) shares of Common Stock and (ii) Common Stock purchase warrants to purchase an additional two hundred and fifty (250) shares of Common Stock at a per share exercise price of $0.01. The investor’s Plan account was credited with the number of shares of the Company’s Common Stock and Warrants that are acquired under the Units purchased. Each warrant affords the participant the opportunity to purchase one share of our Common Stock at a warrant exercise price of $0.01.                      
Expiration date, description   The warrants became exercisable on February 25, 2019 and continued to be exercisable through February 25, 2020 at a per share exercise price of $0.01. On May 29, 2019, the Company extended the termination date of the ZNWAK Warrant by one (1) year from the expiration date of February 25, 2020 to February 25, 2021. Zion considers this warrant as permanent equity per ASC 815-40-35-2. As such, there is no value assigned to this extension. On September 15, 2020, the Company extended the termination date of the ZNWAK Warrant by two (2) years from the expiration date of February 25, 2021 to February 25, 2023.                      
Unit Option Program [Member] | Znwaf [Member]                          
Stockholders' Equity (Details) [Line Items]                          
New unit program, description   This unit offering consisted of a new combination of common stock and warrants, a new time period in which to purchase under the program, and a new unit price, but otherwise the same unit program features, conditions and terms in the Prospectus Supplement applied. The unit offering terminated on July 12, 2017. This program enabled participants to purchase Units of the Company’s securities where each Unit (priced at $250.00 each) was comprised of (i) the number of shares of Common Stock determined by dividing $250.00 (the price of one Unit) by the average of the high and low sale prices of the Company’s Common Stock as reported on the NASDAQ on the unit purchase date and (ii) Common Stock purchase warrants to purchase an additional 25 shares of Common Stock at a warrant exercise price of $1.00 per share. The warrant is referred to as “ZNWAF.”                      
Amended and Restated Certificate of Incorporation [Member] | Minimum [Member]                          
Stockholders' Equity (Details) [Line Items]                          
Increase in shares authorized (in Shares) 400,000,000                        
Amended and Restated Certificate of Incorporation [Member] | Maximum [Member]                          
Stockholders' Equity (Details) [Line Items]                          
Increase in shares authorized (in Shares) 800,000,000