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Note Q - Equity (Details Textual) - USD ($) |  |  |  |  |  |  | 1 Months Ended | 2 Months Ended | 5 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 24, 2018 | Aug. 22, 2018 | Nov. 11, 2015 | Oct. 29, 2015 | Sep. 23, 2015 | Nov. 13, 2014 | May 31, 2018 | Apr. 30, 2018 | Mar. 31, 2018 | Oct. 31, 2017 | Sep. 30, 2017 | May 23, 2018 | May 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2015 | Mar. 31, 2020 | Mar. 12, 2020 | Feb. 13, 2020 | Aug. 23, 2018
Preferred Stock, Shares Authorized (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,000,000 |  |  |  |  |  |  |
Preferred Stock, Par or Stated Value Per Share (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.0001 |  |  |  |  |  |  |
Share Price (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.50 |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  | $ 3.60 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments of Stock Issuance Costs |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 361,273 | $ 143,945 |  |  |  |  |  |
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture, Total |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 35,013 | $ 37,532 |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |  |  |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.65 |  |  |
Subsequent Event [Member] | Convertible Note Due in July 13, 2020 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Conversion Price (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1.15 |
Promissory Note [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  |  |  | 69,445 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amended Note [Member] | Subsequent Event [Member] | Senior Secured Convertible Note [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Conversion Price (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.65 |  |
Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,380,000 |  |  |  |  |  |
Conversion of Stock, Shares Issued (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 98,893 |  |  |  |  |  |
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture, Total (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  | 36,897 | 20,976 |  |  |  |  |  |
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture, Total |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3 | $ 2 |  |  |  |  |  |
Director [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture, Total (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  | 36,897 | 20,976 |  |  |  |  |  |
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture, Total |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 35,013 | $ 37,532 |  |  |  |  |  |
Securities Purchase Agreement Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ 1.50 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | 2,392,502 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 996,877
Fair Value Adjustment of Warrants | $ 1,288,139 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
September 2015 Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ 1.50 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3.60
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | 166,668 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 69,445
Fair Value Adjustment of Warrants | $ 140,827 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Offering [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) | 1,380,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Units Issued During Period, Units, New Issues (in shares) |  | 1,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Common Shares Called, Per Unit (in shares) |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares Issued, Price Per Share (in dollars per share) |  | $ 1.50 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants and Rights Outstanding, Term (Year) |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance or Sale of Equity, Total | $ 2,070,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments for Commissions, Percent | 7.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments for Commissions | $ 144,900 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments for Underwriting Expenses for Issuance or Sale of Equity | 50,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance or Sale of Equity, Net, Total | $ 1,875,100 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Offering [Member] | August 2018 Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares) |  | 0.75 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  | $ 1.50 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | 1,035,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Over-Allotment Option [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  | 180,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  | 135,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Private Investor SPA [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  |  |  |  |  | 664,584 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  |  |  |  | $ 3.60 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  |  |  |  | 996,877 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Private Placement |  |  |  |  |  | $ 1,595,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term Of Warrant (Year) |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion from Series A-1 Preferred Stock to Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of Stock, Shares Converted (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 27,404 |  |  |  |  |
Conversion of Stock, Shares Issued (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 1,738,778 |  |  | 761,222 |  |  |  |  |
Conversion of Dividends Payable on Series A-1 Preferred Stock to Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of Dividends Payable, Amount Converted |  |  |  |  |  |  |  |  |  |  |  |  | $ 356,015 |  | 356,015 |  |  |  |  |  |
Conversion of Dividends Payable, Shares Issued (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 98,893 |  |  |  |  |  |  |  |
Conversion of Series B-1 Shares into Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of Stock, Shares Issued (in shares) |  |  |  |  |  |  |  |  |  |  |  | 2,916,668 |  |  |  |  |  |  |  |  |
Conversion of Dividends Payable on Series B-1 Preferred Stock to Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of Dividends Payable, Amount Converted |  |  |  |  |  |  |  |  |  |  |  | $ 472,426 |  |  | $ 472,426 |  |  |  |  |  |
Conversion of Dividends Payable, Shares Issued (in shares) |  |  |  |  |  |  |  |  |  |  |  | 131,229 |  |  |  |  |  |  |  |  |
Series A-1 Convertible Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Authorized (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,000 |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  |  | 5,500 | 84,500 |  |  |  |  |  |  |  |  |  |  |  |  | 90,000 |  |  |  |
Preferred Stock, Shares Outstanding, Ending Balance (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |
Share Price (in dollars per share) |  |  | $ 100 | $ 100 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Convertible Preferred Stock |  |  | $ 550,000 | $ 8,450,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of Dividends Payable, Amount Converted |  |  |  |  |  |  | $ 25,463 | $ 330,552 |  |  | $ 540,000 |  |  |  |  | $ 540,000 |  |  |  |  |
Conversion of Stock, Shares Issued (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 150,000 |  |  |  |  |
Conversion of Stock, Shares Converted (in shares) |  |  |  |  |  |  | 23,508 | 39,088 |  | 27,404 |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Issued, Total (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |  |  |  |  |  |
Series B-1 Convertible Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Authorized (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  | 105,000 |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  |  | 105,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | 105,000 |  |  |  |
Preferred Stock, Shares Outstanding, Ending Balance (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |
Share Price (in dollars per share) |  |  | $ 100 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Convertible Preferred Stock |  |  | $ 10,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of Dividends Payable, Amount Converted |  |  |  |  |  |  | $ 55,342 |  | $ 417,084 |  |  |  |  |  |  |  |  |  |  |  |
Conversion of Stock, Shares Converted (in shares) |  |  |  |  |  |  | 44,580 |  | 60,420 |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Issued, Total (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |  |  |  |  |  |
September 2015 Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  |  |  | $ 3.60 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term Of Warrant (Year) |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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