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Note I - Stock Option Plans (Details Textual) - USD ($)	12 Months Ended
Note I - Stock Option Plans (Details Textual) - USD ($)	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Jun. 28, 2023
Share-Based Payment Arrangement, Expense	$ 1,345,122	$ 1,467,426
Share-Based Payment Arrangement, Option [Member]
Share-Based Payment Arrangement, Amount Capitalized	700,000	900,000
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount	$ 900,000
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)	1 year 3 months 18 days
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)	0
Share-Based Payment Arrangement, Option [Member] \| Share-Based Payment Arrangement, Nonemployee [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)	24,999
Share-Based Payment Arrangement, Expense	$ 9,800	19,700
Restricted Stock [Member]
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount	0
Share-Based Payment Arrangement, Expense	$ 0	(15,000)
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)	730,340
Restricted Stock [Member] \| Territory Manager [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)			2 years
Restricted Stock [Member] \| Board of Directors [Member]
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount	$ 171,000
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)	3 months
Share-Based Payment Arrangement, Expense	$ 638,000	$ 576,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)	730,340
Share Price (in dollars per share)	$ 0.89
Restricted Stock [Member] \| Board of Directors [Member] \| Share-Based Payment Arrangement, Tranche One [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage	25.00%
Restricted Stock [Member] \| Board of Directors [Member] \| Share-Based Payment Arrangement, Tranche Two [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage	25.00%
The 2020 Equity Incentive Plan [Member] \| Share-Based Payment Arrangement, Option [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares)				11,500,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)	3 years
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)	5 years
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares)	7,579,778	9,174,520