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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 |

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