Stockholders' Equity (Narrative) (Details) - USD ($)					12 Months Ended
	Oct. 06, 2020	Nov. 25, 2019	Jun. 01, 2018	Sep. 14, 2016	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2012	Dec. 31, 2010	Dec. 31, 2003	Dec. 31, 2018
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
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
Options, Exercised (in shares)					383,350	31,276
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 stock, each convertible to common shares					40	40
Series N preferred shares, conversion price per share					$ 1,000
Term of Stock-Based Compensation Plan					6 years 9 months 18 days	6 years 9 months 18 days
Options to purchase, Granted (in shares)					474,750	649,850
Exercise Price, Outstanding					$ 0.63	$ 0.51				$ 0.75
Exercise price, options granted in period					$ 1.62	$ 0.74
Stock-based compensation expense					$ 353,000	$ 283,000
Tax benefit recognized					$ 200,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares					950,125	1,454,514
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value					$ 0.71	$ 0.39
Unrecognized stock-based compensation					$ 600,000
Unrecognized stock-based compensation, Period for recognition					3 years 1 month 6 days
Fair Value of Options Vested in Period					$ 300,000	$ 300,000
Aggregate intrinsic value of exercisable options					$ 6,300,000	$ 1.2
Other Options Issued [Member]
Class Of Stock [Line Items]
Options, Exercised (in shares)					10,625
Options to purchase, Granted (in shares)					90,000	265,000	625,000
Exercise price, options granted in period					$ 1.41
Stock Options [Member]
Class Of Stock [Line Items]
Options, Exercised (in shares)					383,350	31,276
Stock Options [Member] | Selling, General and Administrative Expenses [Member]
Class Of Stock [Line Items]
Stock-based compensation expense					$ 400,000	$ 300,000
Restricted Stock [Member]
Class Of Stock [Line Items]
Unrecognized stock-based compensation expense					$ 100,000	$ 200,000
Minimum [Member] | Other Options Issued [Member]
Class Of Stock [Line Items]
Exercise price, options granted in period						$ 0.70
Maximum [Member] | Other Options Issued [Member]
Class Of Stock [Line Items]
Exercise price, options granted in period						$ 0.85
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
2010 Non-Qualified Stock Option Plan [Member]
Class Of Stock [Line Items]
Number of Shares Authorized for Stock-Based Compensation Plan								1,250,000
Options to purchase, Granted (in shares)					125,000	60,000
Stock Option Award Vesting Period								4 years
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								$ 2.77
2010 Non-Qualified Stock Option Plan [Member] | Directors [Member] | Annual Compensation Plan [Member]
Class Of Stock [Line Items]
Options to purchase, Granted (in shares)						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)					372,725	31,276
Number of Shares Authorized for Stock-Based Compensation Plan				3,150,000
Options to purchase, Granted (in shares)				2,539,200	259,750	324,850
Stock Option Award Vesting Period				4 years
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				$ 2.77
Common Stock [Member]
Class Of Stock [Line Items]
Issuance of common stock in public offering, net, shares					5,462,500
Options, Exercised (in shares)					274,582	10,783
Issuance of common stock for services rendered, shares					205,000	75,000
Share price						$ 25.00
Series N preferred stockholders to liquidation preference, conversion price per share						$ 1,000
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.
Conversion of series N preferred stock to shares of common stock					0	1
Maxim Group LLC [Member]
Class Of Stock [Line Items]
Issuance of common stock for services rendered, shares		75,000			205,000
David Ludwig And Tom Ludwig [Member]
Class Of Stock [Line Items]
Issuance of restricted common stock (in shares)			600,000
David Ludwig And Tom Ludwig [Member] | Restricted Stock [Member]
Class Of Stock [Line Items]
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