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Note S - Stock Options (Details Textual) - USD ($)			12 Months Ended
	Jan. 27, 2016	Oct. 12, 2004	Dec. 31, 2021	Dec. 31, 2020	Jun. 12, 2020	Mar. 12, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term (Year)			3 years 10 days	3 years 10 months 13 days
Share Price (in dollars per share)			$ 2.21	$ 3.52	$ 5.20	$ 6.08	$ 4.00
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number (in shares)			186,538
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share)				$ 3.16
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value			$ 0	$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in shares)			(0)	(0)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value			$ 252,874	$ 899,750
Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount			$ 75,035
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)			10 months 9 days
In The Money Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number (in shares)			0	0
The2004 Stock Option Plan [Member]
Common Stock, Capital Shares Reserved for Future Issuance (in shares)		20,834
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number (in shares)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in shares)			(0)	(0)
The2004 Stock Option Plan [Member] | Nonstatutory Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term (Year)		10 years
The2004 Stock Option Plan [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent		85.00%
The 2015 Equity Incentive Plan [Member]
Common Stock, Capital Shares Reserved for Future Issuance (in shares)	83,334		789,000	187,500			187,500
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)	10 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number (in shares)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in shares)			(0)	(0)
The 2015 Equity Incentive Plan [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent			100.00%
The 2015 Equity Incentive Plan [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent			110.00%

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Aggregate number of common shares reserved for future issuance.

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