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Note 4 - Investment and Equity Securities - Amortized Cost and Fair Values of Securities Available for Sale (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Amortized cost $ 108,937 $ 103,401
Gross unrealized gains 5,435 2,466
Gross unrealized losses (12) (134)
Investment securities available for sale, at fair value 114,360 105,733
Subordinated Debt Securities [Member]    
Amortized cost 21,050 4,000
Gross unrealized gains 254 126
Gross unrealized losses (7) 0
Investment securities available for sale, at fair value 21,297 4,126
Taxable Municipal Bonds [Member]    
Amortized cost 500 500
Gross unrealized gains 2 1
Gross unrealized losses 0 0
Investment securities available for sale, at fair value 502 501
Nontaxable Municipal Bonds [Member]    
Amortized cost 73,157 80,436
Gross unrealized gains 4,643 2,065
Gross unrealized losses 0 (25)
Investment securities available for sale, at fair value 77,800 82,476
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Amortized cost 14,230 18,465
Gross unrealized gains 536 274
Gross unrealized losses (5) (109)
Investment securities available for sale, at fair value $ 14,761 $ 18,630