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Note S - Stock Options (Details Textual) - USD ($)			12 Months Ended
	Jan. 27, 2016	Oct. 12, 2004	Dec. 31, 2020	Dec. 31, 2019	Jun. 12, 2020	Mar. 12, 2020
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term (Year)			3 years 317 days	5 years
Share Price (in dollars per share)			$ 3.52		$ 5.20	$ 6.08
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number (in shares)			167,980
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	$ 8.24
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, Vested in Period, Fair Value			899,750	$ 891,760
Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount			$ 232,547
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)			1 year 76 days
In The Money Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number (in shares)			0
The2004 Stock Option Plan [Member]
Common Stock, Capital Shares Reserved for Future Issuance (in shares)		20,834
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		187,500	187,500
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)	10 years
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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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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