Note 13 - Income Taxes (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount		$ 0
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	$ 8,000,000	6,700,000
Unrecognized Tax Benefits, Interest on Income Taxes Expense	197,700	86,200	$ 22,800
Unrecognized Tax Benefits, Income Tax Penalties Accrued	0
Unrecognized Tax Benefits, Interest on Income Taxes Accrued	530,000	389,000	$ 302,000
Undistributed Earnings of Foreign Subsidiaries	$ 26,100,000	$ 22,900,000
Effective Income Tax Rate Reconciliation, Dividend Received Deduction, Percent	100.00%
State and Local Jurisdiction [Member]
Operating Loss Carryforwards	$ 39,200,000
Deferred Tax Assets, Operating Loss Carryforwards	$ 1,700,000
Open Tax Year	2020 2021 2022 2023 2024
Domestic Tax Jurisdiction [Member]
Open Tax Year	2021 2022 2023 2024