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Note 4 - Investment Securities (Details Textual)
12 Months Ended
Jan. 01, 2018
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain (Loss), before Tax, Total   $ 2,910,000 $ (2,863,000) $ (809,000)
Available-for-sale Securities Income Tax Expense (Benefit) on Accumulated Gross Unrealized Gains Losses   $ 861,000 $ (846,000) $ (239,000)
Number of Securities Sold During Period   55 18 16
Proceeds from Sale of Debt Securities, Available-for-sale   $ 19,668,000 $ 4,157,000 $ 9,594,000
Debt Securities, Available-for-sale, Realized Gain (Loss), Total   $ 114,000 $ (8,000) $ (158,000)
Number of Securities Sold for Gain   28 8 4
Debt Securities, Available-for-sale, Realized Gain   $ 164,000 $ 4,000 $ 4,000
Number of Securities Sold for Loss   27 10 12
Debt Securities, Available-for-sale, Realized Loss   $ 50,000 $ 12,000 $ 162,000
Number of Investment Securities   185    
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions   42    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions   19    
Available-for-sale Debt Securities Pledged to Secure Deposits and Repurchase Agreements Amortized Cost Basis   $ 83,596,000 92,166,000  
Debt Securities, Held-to-maturity, Total   0 0  
Gain on Adjusting Carrying Value of Equity Securities with No Readily Determinable Fair Value   209,000
Accounting Standards Update 2016-01 [Member]        
Gain on Adjusting Carrying Value of Equity Securities with No Readily Determinable Fair Value $ 209,000      
Equity Securities without Readily Determinable Fair Value, Amount $ 662,000      
Collateral Pledged [Member]        
Debt Securities, Available-for-sale, Restricted   $ 84,625,000 $ 90,122,000  
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]        
Number of Investment Securities   96    
US States and Political Subdivisions Debt Securities [Member]        
Number of Investment Securities   89