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Note K - Stockholders' Equity (Details Textual) - USD ($) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Feb. 28, 2019 | Jan. 31, 2017 | Dec. 31, 2016 | May 31, 2014 | Dec. 31, 2018 | Dec. 31, 2017
Proceeds from Issuance of Private Placement | $ 250,000 |  |  | $ 10,000,000 |  | $ 150,836
Common Stock, Capital Shares Reserved for Future Issuance |  |  |  |  | 5,315,974 | 5,111,582
Other Stock Options and Warrants [Member] |  |  |  |  |  |
Common Stock, Capital Shares Reserved for Future Issuance |  |  |  |  | 2,845,409 | 3,710,335
Chief Executive Officer, Chief Financial Officer and Employees [Member] |  |  |  |  |  |
Deferred Compensation Arrangement with Individual, Shares Authorized for Issuance |  |  | 1,374,931 |  |  | 1,908,813
Non-Employees [Member] |  |  |  |  |  |
Common Stock, Capital Shares Reserved for Future Issuance |  |  |  |  | 561,752 | 26,316
Underwritten Public Offering [Member] |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  |  | 2,000,000 |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  |  | 1,592,775 |  |  |
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right |  |  | 0.75 |  |  |
Shares Issued, Price Per Share |  |  | $ 1.50 |  |  |
Proceeds from Issuance of Common Stock |  |  | $ 3,000,000 |  |  |
Class of Warrant or Right, Expiration Period |  |  | 3 years |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  |  | $ 2.55 |  |  |
Over-Allotment Option [Member] |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  | 123,700 |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  |  | 92,775 |  |  |
Shares Issued, Price Per Share |  | $ 1.499 |  |  |  |
Proceeds from Issuance of Common Stock |  | $ 186,000 |  |  |  |
Private Placement [Member] |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  |  |  | 2,000,000 |  |
Shares Issued, Price Per Share |  |  |  | $ 1.50 |  |
Proceeds from Issuance of Common Stock |  |  |  | $ 3,000,000 |  |
Proceeds from Issuance of Convertible Preferred Stock |  |  |  | $ 7,000,000 |  |
Private Placement [Member] | Series A Convertible Preferred Stock [Member] |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  |  |  | 7,000 |  |
Shares Issued, Price Per Share |  |  |  | $ 1,000 |  |
Preferred Stock, Redemption Price Per Share |  |  |  | 2.545 |  |
Private Placement [Member] | Series A Convertible Preferred Stock [Member] | Conversion Price if Common Stock Not Trade at 3.15 [Member] |  |  |  |  |  |
Preferred Stock, Redemption Price Per Share |  |  |  | $ 1.50 |  |

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