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Note R - Equity (Details Textual) |  |  |  |  | 1 Months Ended | 4 Months Ended | 12 Months Ended | 24 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 20, 2020 | Jul. 23, 2020 USD ($) shares | Mar. 30, 2020 USD ($) $ / shares shares | Feb. 14, 2020 USD ($) $ / shares shares | Nov. 30, 2020 USD ($) shares | Aug. 31, 2020 USD ($) shares | Nov. 30, 2020 | Dec. 31, 2020 USD ($) $ / shares shares | Dec. 31, 2019 USD ($) shares | Dec. 31, 2020 $ / shares shares | Sep. 30, 2020 USD ($) shares | Jun. 30, 2020 USD ($) shares | Mar. 12, 2020 $ / shares | Sep. 23, 2015 $ / shares shares | Nov. 13, 2014 shares
Preferred Stock, Shares Authorized (in shares) |  |  |  |  |  |  |  | 5,000,000 |  | 5,000,000 |  |  |  |  |
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares |  |  |  |  |  |  |  | $ 0.0001 |  | $ 0.0001 |  |  |  |  |
Stock Issued During Period, Shares, Warrants Exercises (in shares) |  |  | 121,500 |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares |  |  | $ 12 | $ 5.20 |  |  |  |  |  |  |  |  |  |  |
Proceeds from Warrant Exercises | $ |  |  | $ 1,458,000 |  |  |  |  | $ 5,602,595 |  |  |  |  |  |  |
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures, Total (in shares) |  |  |  |  | 3,125 | 38,250 |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Expense | $ |  |  |  |  |  |  |  | 792,095 | 947,720 |  |  |  |  |  |
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture, Total | $ |  |  |  |  |  |  |  | $ 28,511 | $ 35,013 |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in shares) |  |  |  |  |  |  |  | 0 | 0 |  |  |  |  |  |
Dividends, Paid-in-kind, Total | $ |  |  |  | $ 41,688 |  |  |  | $ 112,686 |  |  |  |  |  |  |
Convertible Note Due in July 13, 2020 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Conversion Price (in dollars per share) | $ / shares |  |  |  | $ 9.20 |  |  |  |  |  |  |  |  |  |  |
Senior Secured Convertible Note [Member] | Amended Note [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Conversion Price (in dollars per share) | $ / shares |  |  |  | $ 5.20 |  |  |  |  |  |  |  |  | $ 5.20 |  |
Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  |  |  |  |  |  |  | 43,939 |  |  |  |  |  |  |
Stock Issued During Period, Shares, Conversion of Warrant (in shares) |  |  |  |  |  |  |  | 918,538 |  |  |  |  |  |  |
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures, Total (in shares) |  |  |  |  |  |  |  | 41,375 |  |  |  |  |  |  |
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture, Total (in shares) |  |  |  |  |  |  |  | 5,270 | 4,612 |  |  |  |  |  |
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture, Total | $ |  |  |  |  |  |  |  |  | $ 1 |  |  |  |  |  |
Director [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture, Total (in shares) |  |  |  |  |  |  |  | 5,270 | 4,612 |  |  |  |  |  |
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture, Total | $ |  |  |  |  |  |  |  | $ 28,511 | $ 35,013 |  |  |  |  |  |
Restricted Stock [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, Options, Grants in Period, Fair Value | $ |  |  |  |  | $ 11,250 | $ 198,900 |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Expense | $ |  |  |  |  |  |  |  | $ 23,764 |  |  |  |  |  |  |
Pre-Funded Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercised During Period (in shares) |  | 512,500 |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercised During Period (in shares) |  | 284,538 |  |  |  |  |  |  |  |  |  |  |  |  |
September 2015 Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 28.80 |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  |  | 48,078 |  |  |  |  |  |  |  |  |  | 8,681 |
Warrants and Rights Outstanding, Term (Year) |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |
Referral Fee Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  |  |  |  |  |  |  |  |  | 3,125 | 15,625 |  |  |
Warrants and Rights Outstanding | $ |  |  |  |  |  |  |  |  |  |  | $ 12,921 | $ 94,655 |  |  |
Warrants in Connection With May 2020 and June 2020 Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Issued During Period (in shares) |  |  |  |  |  |  |  | 415,625 |  |  |  |  |  |  |
Warrants in Connection With the Securities Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Issued During Period (in shares) |  |  |  |  |  |  |  |  | 250,000 |  |  |  |  |  |
Public Offering [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance or Sale of Equity, Total | $ |  | $ 22,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  | 4,264,313 |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Conversion of Warrant (in shares) |  | 797,038 |  |  |  |  |  |  |  |  |  |  |  |  |
Public Offering [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  |  |  |  |  |  |  | 4,264,313 |  |  |  |  |  |  |
Private Investor SPA [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 124,610
Reverse Stock Split [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity Note, Stock Split, Conversion Ratio | 8 |  |  |  |  |  |  |  |  |  |  |  |  |  |

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