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Note C - Summary of Significant Accounting Policies (Details Textual) | 12 Months Ended
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Dec. 31, 2021 USD ($) shares | Dec. 31, 2020 USD ($) shares
Number of Operating Segments | 2 |
Short-term Investments, Total | $ 13,900,000 | $ 13,100,000
Accounts Receivable, Allowance for Credit Loss, Ending Balance | 10,000 | 10,000
Gain (Loss) on Extinguishment of Debt, Total | 276,180 | 0
Unrecognized Tax Benefits, Ending Balance | 0 | $ 0
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense, Total | $ 0 |
Weighted Average Number of Shares Outstanding, Basic, Total (in shares) | shares | 68,829,860 | 63,061,358
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) | shares | 7,291,800 | 8,397,836
Minimum [Member] |  |
Property, Plant and Equipment, Useful Life (Year) | 3 years |
Maximum [Member] |  |
Property, Plant and Equipment, Useful Life (Year) | 7 years |

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