Note 11 - Retirement Plans - Allocation of Plan Assets (Details)	Dec. 31, 2025	Dec. 31, 2024
Plan assets, percent	100.00%	100.00%
Insurance General Account [Member]
Plan assets, percent	0.00%	13.00%
Cash and Cash Equivalents [Member]
Plan assets, percent	19.00%	3.00%
Fixed Income Securities [Member]
Plan assets, percent	81.00%	84.00%