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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 |  |  |  |

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