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Note 8 - Financial Instruments - Investments - Trading (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Investments-trading $ 223,865 $ 242,961
Corporate Bonds and Redeemable Preferred Stock [Member]    
Investments-trading 45,519 36,388
Foreign Government Bonds [Member]    
Investments-trading 467 659
Municipal Bonds [Member]    
Investments-trading 18,841 19,400
Certificates of Deposit [Member]    
Investments-trading 169 70
Derivative [Member]    
Investments-trading 1,275 13,717
Equity Securities [Member]    
Investments-trading 1,118 428
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Debt securities 134,093 162,031
US Government Agencies Debt Securities [Member]    
Debt securities 22,373 6,904
Residential Mortgage Backed Securities [Member]    
Debt securities 9 14
US Treasury Securities [Member]    
Debt securities 0 607
Asset-backed Securities [Member]    
Debt securities 1 1
Small Business Administration Loans [Member]    
Debt securities $ 0 $ 2,742