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Note 18 - Fair Value Measurements - Changes in Level 3 Assets Measured at Fair Value on a Recurring Basis (Details) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Acquisition   $ 2,756,000
Equity Securities [Member]    
Balance $ 1,472,000 886,000
Total realized and unrealized gains included in income 13,000 114,000
Net purchases, sales, calls, and maturities 0 0
Net transfers into Level 3 0 0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Acquisition 0 472,000
Balance, December 31 1,485,000 1,472,000
Available-for-sale Securities [Member]    
Balance 12,367,000 8,498,000
Total realized and unrealized gains included in income 0 0
Net purchases, sales, calls, and maturities (1,456,000) 1,375,000
Net transfers into Level 3 0 0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Acquisition 0 2,284,000
Balance, December 31 11,423,000 12,367,000
Total unrealized gains/(losses) included in other comprehensive income $ 512,000 $ 210,000