Note 7 - Financial Instruments - Investments - Trading (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Investments-trading	$ 154,427	$ 140,576
Residential Mortgage-Backed Securities [Member]
Debt securities	3	3
Small Business Administration Loans [Member]
Debt securities	42,286	43,090
Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member]
Debt securities	49,194	42,471
US Government Agencies Debt Securities [Member]
Debt securities	18,348	17,675
Corporate Bonds and Redeemable Preferred Stock [Member]
Investments-trading	21,354	18,449
Derivative [Member]
Investments-trading	14,975	4,651
Equity Securities [Member]
Investments-trading	7,415	10,424
Municipal Bonds [Member]
Investments-trading	$ 852	$ 3,813