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Note E - Concentration of Risk (Details Textual) - USD ($) | 12 Months Ended | 24 Months Ended
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2018
Cash, Uninsured Amount | $ 0 | $ 0 | $ 0
Accounts Receivable, Net, Total | 1,574,032 | 3,635,946 | 1,574,032
Allowance for Doubtful Accounts Receivable, Noncurrent | $ 1,720,000 | $ 1,000,000 | $ 1,720,000
Percentage of Remaining Balance Owned Reserved | 100.00% | 58.00% | 58.00%
Customer A [Member] |  |  |
Accounts Receivable, Net, Total | $ 1,720,000 |  | $ 1,720,000

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