Note 7 - Income Taxes (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Deemed Dividend Paid by Foreign Subsidiary		$ 1,400,000
Withholding Tax on Dividend Distribution, Percent		5.00%
Cumulative Tax Incentives	$ 265,000	$ 200,000	$ 510,000
Income Tax Credits and Adjustments	$ 10,000	$ 2,000	$ 36,000
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	21.00%	21.00%
Share Repurchase Program, Excise Tax	$ 311,000	$ 152,000
Research and Experimentation, Capitalized Costs	5,500,000	7,800,000	$ 7,100,000
Research & experimental expenditures	3,925,000	2,903,000
Unrecognized Tax Benefits	2,176,000	1,943,000	$ 1,557,000
Unrecognized Tax Benefits, Interest on Income Taxes Accrued	68,000	43,000
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	$ 1,900,000	1,600,000
Domestic Tax Jurisdiction [Member]
Open Tax Year	2021 2022 2023 2024
State and Local Jurisdiction [Member]
Open Tax Year	2018 2019 2020 2021 2022 2023 2024
Foreign Tax Jurisdiction [Member] | Canada Revenue Agency [Member]
Open Tax Year	2020 2021 2022 2023 2024
Domestic Research [Member]
Tax Amortization Period (Year)	5 years
Foreign Research [Member]
Tax Amortization Period (Year)	15 years
Canadian Subsidiary [Member]
Capital Returns from Subsidiary		$ 1,200,000