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Note 8 - Fair Value Measurements - Carrying Value and Estimated Fair Value of Financial Instruments (Details) - USD ($)
Mar. 31, 2019
Dec. 31, 2018
Securities available for sale $ 255,035,000 $ 261,841,000
Equity Securities, FV-NI 1,800,000  
Reported Value Measurement [Member]    
Cash and cash equivalents 55,543,000 41,112,000
Interest-bearing time deposits 6,735,000 7,710,000
Securities available for sale 255,035,000 261,841,000
Loans held for sale 1,377,000 2,849,000
Loans, net 449,781,000 434,260,000
FHLB and other restricted stock 1,988,000 1,988,000
Accrued interest receivable 2,835,000 2,828,000
Equity Securities, FV-NI 1,845,000 1,715,000
Deposits 718,531,000 701,646,000
Accrued interest payable 177,000 150,000
Estimate of Fair Value Measurement [Member]    
Cash and cash equivalents 55,543,000 41,112,000
Interest-bearing time deposits 6,757,000 7,650,000
Securities available for sale 255,035,000 261,841,000
Loans held for sale 1,401,000 2,900,000
Loans, net 458,899,000 427,200,000
Accrued interest receivable 2,835,000 2,828,000
Equity Securities, FV-NI 1,845,000 1,715,000
Deposits 717,117,000 699,864,000
Accrued interest payable 177,000 150,000
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]    
Cash and cash equivalents 55,543,000 41,112,000
Interest-bearing time deposits
Securities available for sale
Loans held for sale
Loans, net
Accrued interest receivable
Equity Securities, FV-NI 1,845,000 1,715,000
Deposits
Accrued interest payable
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]    
Cash and cash equivalents
Interest-bearing time deposits 6,757,000 7,650,000
Securities available for sale 255,035,000 261,841,000
Loans held for sale 1,401,000 2,900,000
Loans, net
Accrued interest receivable 2,835,000 2,828,000
Equity Securities, FV-NI
Deposits
Accrued interest payable 177,000 150,000
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]    
Cash and cash equivalents
Interest-bearing time deposits
Securities available for sale
Loans held for sale
Loans, net 458,899,000 427,200,000
Accrued interest receivable
Equity Securities, FV-NI
Deposits 717,117,000 699,864,000
Accrued interest payable