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Note 20 - Fair Value of Financial Instruments and Fair Value Measurements - Financial Instruments (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Reported Value Measurement [Member]    
Cash and Short-Term Investments $ 60,155 $ 57,813
Investment Securities Available for Sale 353,066 354,247
Federal Home Loan Bank Stock 2,978 3,043
Loans, Net 774,249 757,281
Bank-Owned Life Insurance 17,598 17,089
Deposits 1,085,125 1,067,985
Subordinated Debentures 24,229 24,229
Other Borrowed Money 44,000 47,500
Estimate of Fair Value Measurement [Member]    
Cash and Short-Term Investments 60,155 57,813
Investment Securities Available for Sale 353,066 354,247
Federal Home Loan Bank Stock 2,978 3,043
Loans, Net 769,809 757,163
Bank-Owned Life Insurance 17,598 17,089
Deposits 1,086,503 1,068,392
Subordinated Debentures 24,229 24,229
Other Borrowed Money 44,032 47,626
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]    
Cash and Short-Term Investments 60,155 57,813
Investment Securities Available for Sale
Federal Home Loan Bank Stock 2,978 3,043
Loans, Net
Bank-Owned Life Insurance 17,598 17,089
Deposits 744,094 727,818
Subordinated Debentures
Other Borrowed Money
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]    
Cash and Short-Term Investments
Investment Securities Available for Sale 348,788 346,950
Federal Home Loan Bank Stock
Loans, Net 766,457 752,287
Bank-Owned Life Insurance
Deposits 342,409 340,574
Subordinated Debentures 24,229 24,229
Other Borrowed Money 44,032 47,626
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]    
Cash and Short-Term Investments
Investment Securities Available for Sale 4,278 7,297
Federal Home Loan Bank Stock
Loans, Net 3,352 4,876
Bank-Owned Life Insurance
Deposits
Subordinated Debentures
Other Borrowed Money