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Note T - Subsequent Events (Details Textual) - USD ($) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Feb. 28, 2019 | May 31, 2014 | Dec. 31, 2018 | Dec. 31, 2017
Proceeds from Stock Options Exercised |  |  |  |  | $ 62,500
Proceeds from Issuance of Private Placement |  | $ 250,000 | $ 10,000,000 |  | $ 150,836
Private Placement [Member] |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  |  | 2,000,000 |  |
Subsequent Event [Member] | Warrants, Public Offering [Member] |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  | 1,428,000 |  |  |
Warrants and Rights Outstanding, Term |  | 5 years |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  | $ 0.50 |  |  |
Subsequent Event [Member] | Warrants, Private Offering [Member] |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  | 178,594 |  |  |
Subsequent Event [Member] | Public Offering [Member] |  |  |  |  |
Proceeds from Issuance or Sale of Equity, Total |  | $ 2,000,000 |  |  |
Stock Issued During Period, Shares, New Issues |  | 5,715,000 |  |  |
Proceeds from Stock Options Exercised | $ 198,000 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period | 567,400 |  |  |  |
Subsequent Event [Member] | Private Placement [Member] |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  | 714,286 |  |  |

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