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Note 7 - Stock Option Plans (Details Textual) - USD ($)	3 Months Ended		12 Months Ended
Note 7 - Stock Option Plans (Details Textual) - USD ($)	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024	Dec. 31, 2022	Jun. 28, 2023
Share-Based Payment Arrangement, Expense	$ 330,788	$ 313,505
Share-Based Payment Arrangement, Employee [Member]
Share-Based Payment Arrangement, Expense	171,000	175,000
Share-Based Payment Arrangement, Option [Member]
Share-Based Payment Arrangement, Amount Capitalized	$ 700,000
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)	1 year
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, Employee [Member]
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 Payment Arrangement, Expense	$ 6,600	1,100
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)	16,666
Restricted Stock [Member]
Share-Based Payment Arrangement, Expense	$ 0	2,100
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount	$ 0
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)	0
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, Expense	$ 154,000	$ 137,500
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount	$ 0
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