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Note S - Subsequent Events (Details Textual) - USD ($) |  |  |  |  |  |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 28, 2018 | Mar. 23, 2018 | Nov. 13, 2017 | Sep. 22, 2017 | Aug. 09, 2017 | May 11, 2017 | Mar. 15, 2017 | May 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016
Conversion of Dividends Payable, Shares Issued |  |  |  | 150,000 |  |  |  |  |  |
Conversion of Dividends Payable, Amount Converted |  |  |  |  |  |  |  |  | $ 540,000 |
Stock Issued During Period, Shares, Issued for Services |  |  |  |  |  |  |  | 61,667 |  |
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price |  |  |  |  |  |  |  |  | $ 2.69 | $ 2.74
Stock Issued During Period As a Commitment Fee, Shares |  |  |  |  |  |  |  | 55,000 |  |
Director [Member] |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Issued for Services |  |  | 2,276 |  | 5,148 | 1,925 | 1,895 |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures |  | 212,918 |  |  |  |  |  |  |  |
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price |  | $ 1.96 |  |  |  |  |  |  |  |
Stock Issued During Period As a Commitment Fee, Shares | 762 |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Employee Stock Option [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  | 3 years |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period |  | 7 years |  |  |  |  |  |  |  |
Subsequent Event [Member] | Director [Member] |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Issued for Services |  | 7,659 |  |  |  |  |  |  |  |
Subsequent Event [Member] | Six Non-Employee Members of the Board of Directors [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures |  | 9,000 |  |  |  |  |  |  |  |
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price |  | $ 1.96 |  |  |  |  |  |  |  |
Subsequent Event [Member] | Six Non-Employee Members of the Board of Directors [Member] | Employee Stock Option [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  | 3 years |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period |  | 7 years |  |  |  |  |  |  |  |
Subsequent Event [Member] | Series B-1 Convertible Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |
Preferred Stock Conversion Limitation, Percent |  | 19.99% |  |  |  |  |  |  |  |
Subsequent Event [Member] | Conversion of Series B-1 Shares into Common Stock [Member] |  |  |  |  |  |  |  |  |  |
Conversion of Stock, Shares Converted |  | 60,240 |  |  |  |  |  |  |  |
Conversion of Stock, Shares Issued |  | 1,678,334 |  |  |  |  |  |  |  |
Subsequent Event [Member] | Conversion of Dividends Payable on Series B-1 Preferred Stock to Common Stock [Member] |  |  |  |  |  |  |  |  |  |
Conversion of Dividends Payable, Shares Issued |  | 115,857 |  |  |  |  |  |  |  |
Conversion of Dividends Payable, Amount Converted |  | $ 417,084 |  |  |  |  |  |  |  |
Shares Issued, Price Per Share |  | $ 3.60 |  |  |  |  |  |  |  |

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