Note 6 - Stockholders' Equity, Options, and Warrants (Details Textual) - USD ($)				1 Months Ended		3 Months Ended		6 Months Ended
	May 08, 2023	Mar. 03, 2023	Feb. 28, 2023	Feb. 28, 2023	Jul. 31, 2018	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Mar. 02, 2023	Dec. 31, 2022	Feb. 28, 2022
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares)						20,788,574		20,788,574
Share Price (in dollars per share)						$ 0.08		$ 0.08				$ 0.04
Share-Based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount						$ 161,069		$ 161,069
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)								3,025,000
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)								$ 0.04
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number (in shares)						26,012,500	26,134,500	26,012,500	26,134,500		24,993,500
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price (in dollars per share)						$ 0.05		$ 0.05			$ 0.05
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Forfeitures in Period (in shares)		1,000,000						1,006,000
Series C Preferred Stock [Member]
Preferred Stock, Shares Outstanding (in shares)						4,063		4,063
Preferred Stock, Redemption Price Per Share (in dollars per share)						$ 1,000		$ 1,000
Preferred Stock, Dividend Rate, Percentage								6.00%
Preferred Stock, Convertible, Conversion Price (in dollars per share)						$ 0.10		$ 0.10
Dividends								$ 243,780	$ 243,780
Common Stock Dividends, Shares (in shares)								2,266,500	2,271,980
Dividends, Preferred Stock								$ 90,660	$ 204,480
Dividends, Preferred Stock, Cash								153,120	$ 39,300
Stock Option Repricing [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number (in shares)		12,450,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price (in dollars per share)		$ 0.04
Stock Option Repricing [Member] | Exercise Price One [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price (in dollars per share)										$ 0.06
Stock Option Repricing [Member] | Exercise Price Two [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price (in dollars per share)										0.09
Stock Option Repricing [Member] | Exercise Price Three [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price (in dollars per share)										$ 0.11
The 2015 Incentive Plan [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Additional Shares Authorized (in shares)					20,000,000
The 2015 Incentive Plan [Member] | Chief Executive Officer [Member]
Share-Based Payment Arrangement, Expense				$ 22,400
Shares Issued, Shares, Share-Based Payment Arrangement, before Forfeiture (in shares)				560,000
Shares Issued, Value, Share-Based Payment Arrangement, before Forfeiture				$ 28,000
Shares Issued, Price Per Share (in dollars per share)			$ 0.05	$ 0.05
Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation (in shares)				216,440
Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture (in shares)			343,560
Employee Stock Purchase Plan [Member]
Stock Issued During Period, Shares, Employee Stock Purchase Plans (in shares)									119,910
Proceeds from Stock Plans								$ 4,880	$ 9,173
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares)						2,350,020		2,350,020
Share-Based Payment Arrangement, Option [Member]
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)								1 year 10 months 13 days
Share-Based Payment Arrangement, Expense						$ 64,968	$ 55,517	$ 224,846	$ 237,474
Qualified Options [Member] | Share-Based Payment Arrangement, Employee [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)								3,025,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)								5 years
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year)								10 years
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)						$ 0.04		$ 0.06
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested in Period, Fair Value								$ 79,532
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Dividend Rate								0.00%
Qualified Options [Member] | Share-Based Payment Arrangement, Employee [Member] | Minimum [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Minimum								3.94%
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Minimum								68.65%
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Term (Year)								5 years
Qualified Options [Member] | Share-Based Payment Arrangement, Employee [Member] | Maximum [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Maximum								4.26%
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Maximum								74.16%
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Term (Year)								7 years
Restricted Stock Units (RSUs) [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)		3 years
Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Granted (in shares)		750,000
Restricted Stock Units (RSUs) [Member] | President [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)	6,500,000
Restricted Stock Units (RSUs) [Member] | President [Member] | Share-Based Payment Arrangement, Tranche One [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)	1,500,000
Restricted Stock Units (RSUs) [Member] | President [Member] | Share-Based Payment Arrangement, Tranche Two [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)	2,000,000
Restricted Stock Units (RSUs) [Member] | President [Member] | Share-Based Payment Arrangement, Tranche Three [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)	3,000,000
Restricted Stock Units (RSUs) [Member] | Chief Executive Officer [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares)	2,500,000
Employee Stock Purchase Plan [Member]
Stock Issued During Period, Shares, Employee Stock Purchase Plans (in shares)								191,390