Stockholders' Equity (Narrative) (Details) - USD ($)									12 Months Ended
	Apr. 08, 2021	Oct. 06, 2020	Nov. 25, 2019	Jun. 30, 2018	Dec. 31, 2016	Dec. 31, 2012	Dec. 31, 2010	Dec. 31, 2003	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Class Of Stock [Line Items]
Common stock, shares authorized									300,000,000	300,000,000
Common stock, par value									$ 0.01	$ 0.01
Preferred stock, shares authorized									10,000,000	10,000,000
Preferred stock, par value									$ 10.00	$ 10.00
Options, Exercised (in shares)									1,895,437	383,350
Convertible Preferred Stock, Shares Issuable upon Conversion									the Company’s shares of Series N preferred stock, each of which is convertible to 40 common shares, have the right to receive dividends or dividend equivalents should the Company declare dividends on its common stock.
Series N preferred shares, conversion price per share									$ 1,000
Series N preferred stock, each convertible to common shares									40
Number of Shares Authorized for Stock-Based Compensation Plan									4
Term of Stock-Based Compensation Plan									6 years 7 months 6 days	6 years 9 months 18 days
Options to purchase, Granted (in shares)	25,000								722,500	474,750
Exercise Price, Outstanding									$ 1.23	$ 0.63	$ 0.51
Exercise price, options granted in period									$ 2.28	$ 1.62
Number of Shares Authorized for Stock-Based Compensation Plan									4
Stock-based compensation expense									$ 408,000	$ 353,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares									1,214,938	950,125
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value									$ 0.96	$ 0.71
Unrecognized stock-based compensation									$ 1,200,000
Unrecognized stock-based compensation, Period for recognition									3 years 1 month 6 days
Fair Value of Options Vested in Period									$ 200,000	$ 300,000
Aggregate intrinsic value of exercisable options									1,300,000	6,300,000
Unrecognized stock-based compensation expense									$ 73,000	$ 125,000
Other Options Issued [Member]
Class Of Stock [Line Items]
Options, Exercised (in shares)									22,500	10,625
Options to purchase, Granted (in shares)						625,000			150,000	90,000
Exercise price, options granted in period									$ 1.78	$ 1.41
Restricted Stock [Member]
Class Of Stock [Line Items]
Shares restriction term of service	2 years
Unrecognized stock-based compensation expense									$ 0
Annual Compensation Plan [Member] | Stock Options [Member]
Class Of Stock [Line Items]
Options, Exercised (in shares)									1,895,437	383,350
Tax benefit recognized									$ 1,000,000.0	$ 200,000
Annual Compensation Plan [Member] | Stock Options [Member] | Selling, General and Administrative Expenses [Member]
Class Of Stock [Line Items]
Stock-based compensation expense									$ 400,000	$ 400,000
2003 Stock Option and Appreciation Rights Plan [Member]
Class Of Stock [Line Items]
Number of Shares Authorized for Stock-Based Compensation Plan								2,000,000
Term of Stock-Based Compensation Plan								10 years
Options to purchase, Granted (in shares)								0	0
Number of Shares Authorized for Stock-Based Compensation Plan								2,000,000
2010 Non-Qualified Stock Option Plan [Member]
Class Of Stock [Line Items]
Options, Exercised (in shares)									793,750
Number of Shares Authorized for Stock-Based Compensation Plan							1,250,000
Options to purchase, Granted (in shares)									50,000	125,000
Stock Option Award Vesting Period							4 years
Number of Shares Authorized for Stock-Based Compensation Plan							1,250,000
2010 Non-Qualified Stock Option Plan [Member] | Minimum [Member]
Class Of Stock [Line Items]
Exercise Price, Outstanding							$ 0.24
2010 Non-Qualified Stock Option Plan [Member] | Maximum [Member]
Class Of Stock [Line Items]
Exercise Price, Outstanding							$ 2.85
2010 Non-Qualified Stock Option Plan [Member] | Directors [Member]
Class Of Stock [Line Items]
Options to purchase, Granted (in shares)									50,000	60,000
2010 Non-Qualified Stock Option Plan [Member] | Newly Appointed Independent Directors [Member]
Class Of Stock [Line Items]
Options to purchase, Granted (in shares)										50,000
2010 Non-Qualified Stock Option Plan [Member] | Outside Consultant [Member]
Class Of Stock [Line Items]
Options to purchase, Granted (in shares)										15,000
2016 Stock Option Plan [Member]
Class Of Stock [Line Items]
Options, Exercised (in shares)									1,079,187	372,725
Number of Shares Authorized for Stock-Based Compensation Plan					3,150,000
Options to purchase, Granted (in shares)					2,539,200				522,500	259,750
Stock Option Award Vesting Period					4 years
Number of Shares Authorized for Stock-Based Compensation Plan					3,150,000
2016 Stock Option Plan [Member] | Minimum [Member]
Class Of Stock [Line Items]
Exercise Price, Outstanding					$ 0.45
2016 Stock Option Plan [Member] | Maximum [Member]
Class Of Stock [Line Items]
Exercise Price, Outstanding					$ 3.33
Common Stock [Member]
Class Of Stock [Line Items]
Issuance of common stock in public offering, net, shares										5,462,500
Options, Exercised (in shares)									1,268,399	274,582
Issuance of common stock for services rendered, shares										205,000
Issuance of restricted common stock (in shares)	25,000
Series N preferred shares, conversion price per share									$ 1,000
Series N preferred stock, each convertible to common shares									120
Preferred Stock [Member]
Class Of Stock [Line Items]
Convertible Preferred Stock, Shares Issuable upon Conversion									Each share of Series N preferred stock has a voting entitlement equal to 40 common shares, votes with the common stock on an as-converted basis and is senior to all other preferred stock of the Company. Dividends, if any, will be paid on an as-converted basis equal to common stock dividends. The conversion value of each share of Series N preferred stock is $1,000, and each share is convertible to 40 common shares at the rate of $25.00 per common share. The holders of shares of Series N preferred stock are entitled to liquidation preference over common stockholders equivalent to $1,000 per share.
Share price									$ 25.00
Conversion of series N preferred stock to shares of common stock										0
Maxim Group LLC [Member]
Class Of Stock [Line Items]
Issuance of common stock for services rendered, shares			205,000
IPO [Member]
Class Of Stock [Line Items]
Issuance of common stock in public offering, net, shares		5,462,500
Public offering price		$ 1.75
Additional issuance of underwritten public offering share		712,500
Proceeds from underwritten public offering net of underwriting discounts and commissions		$ 8,700,000
David Ludwig And Tom Ludwig [Member]
Class Of Stock [Line Items]
Issuance of restricted common stock (in shares)				600,000
Stock-based compensation expense									$ 52,000	$ 52,000
Shares restriction term of service				5 years
Weighted average grant date fair value									$ 0.43	$ 0.43