Note 8 - Income Taxes - Reconciliation of Income Tax (Benefit) Expense (Details)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Tax provision at statutory rate – federal	21.00%	21.00%	21.00%
Tax provision at effective state and local rates	(1.40%)	(2.10%)	(0.30%)
Foreign tax rate differential	(32.70%)	(17.10%)	(16.60%)
Executive compensation	(4.80%)	(5.00%)	0.00%
Valuation allowance	6.80%	(5.90%)	(9.40%)
Other	(1.30%)	0.80%	(0.70%)
Total effective income tax rate	(12.40%)	(8.30%)	(6.00%)