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Note 6 - Fair Value Measurements - Changes in Level 3 Assets Measured at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Equity Securities [Member]    
Balance $ 1,768 $ 1,485
Total realized and unrealized gains included in income (1) (40)
Net purchases, sales, calls, and maturities 0 500
Net transfers into Level 3 0 0
Balance 1,767 1,945
Amount of total losses for the period included in earning attributable to the change in unrealized gains (losses) relating to assets and liabilities still held at March 31 (1) (40)
Net transfers into Level 3 (0) (0)
Available-for-Sale Securities [Member]    
Balance 21,050 11,423
Net purchases, sales, calls, and maturities 0 2,453
Net transfers into Level 3 0 0
Balance 0 13,606
Amount of total losses for the period included in earning attributable to the change in unrealized gains (losses) relating to assets and liabilities still held at March 31 0 (270)
Total unrealized gains included in other comprehensive income 0 (270)
Net transfers into Level 3 0 0
Transfer to held to maturity $ (21,050) $ 0