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Note 11 - Fair Value Disclosures - Estimated Fair Value and Carrying Amounts of Financial Instruments (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Estimate of Fair Value Measurement [Member]    
Financial assets:    
Cash and cash equivalents $ 8,968 $ 7,437
Federal Home Loan Bank stock 4,617 4,086
Federal Reserve Bank stock 2,033 1,465
Loans Receivable, Fair Value Disclosure 581,434 505,615
Accrued interest and dividends receivable 3,890 2,555
Mortgage servicing rights 8,411 7,312
Cash surrender value of life insurance 20,405 14,481
Financial liabilities:    
Non-maturing interest bearing deposits 317,044 277,416
Noninterest bearing deposits 142,351 99,799
Time certificates of deposit 159,867 142,202
Accrued expenses and other liabilities 6,082 4,822
Federal Home Loan Bank advances and other borrowings 95,137 82,579
Other long-term debt 23,641 24,209
Estimate of Fair Value Measurement [Member] | Forward Contracts [Member]    
Off-balance-sheet instruments    
Off-balance sheet instruments 0 0
Estimate of Fair Value Measurement [Member] | Commitments to Extend Credit [Member]    
Off-balance-sheet instruments    
Off-balance sheet instruments 0 0
Estimate of Fair Value Measurement [Member] | Interest Rate Lock Commitments [Member]    
Off-balance-sheet instruments    
Off-balance sheet instruments 0 0
Reported Value Measurement [Member]    
Financial assets:    
Cash and cash equivalents 8,968 7,437
Federal Home Loan Bank stock 4,617 4,086
Federal Reserve Bank stock 2,033 1,465
Loans Receivable, Fair Value Disclosure 588,734 506,476
Accrued interest and dividends receivable 3,890 2,555
Mortgage servicing rights 6,947 6,578
Cash surrender value of life insurance 20,405 14,481
Financial liabilities:    
Non-maturing interest bearing deposits 317,044 277,416
Noninterest bearing deposits 142,351 99,799
Time certificates of deposit 161,907 143,349
Accrued expenses and other liabilities 6,082 4,822
Federal Home Loan Bank advances and other borrowings 95,731 82,969
Other long-term debt 25,155 25,155
Reported Value Measurement [Member] | Forward Contracts [Member]    
Off-balance-sheet instruments    
Off-balance sheet instruments 0 0
Reported Value Measurement [Member] | Commitments to Extend Credit [Member]    
Off-balance-sheet instruments    
Off-balance sheet instruments 0 0
Reported Value Measurement [Member] | Interest Rate Lock Commitments [Member]    
Off-balance-sheet instruments    
Off-balance sheet instruments 0 0
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value Measurement [Member]    
Financial assets:    
Cash and cash equivalents 8,968 7,437
Federal Home Loan Bank stock 4,617 4,086
Federal Reserve Bank stock 2,033 1,465
Loans Receivable, Fair Value Disclosure 0 0
Accrued interest and dividends receivable 3,890 2,555
Mortgage servicing rights 0 0
Cash surrender value of life insurance 20,405 14,481
Financial liabilities:    
Non-maturing interest bearing deposits 0 0
Noninterest bearing deposits 142,351 99,799
Time certificates of deposit 0 0
Accrued expenses and other liabilities 6,082 4,822
Federal Home Loan Bank advances and other borrowings 0 0
Other long-term debt 0 0
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value Measurement [Member] | Forward Contracts [Member]    
Off-balance-sheet instruments    
Off-balance sheet instruments 0 0
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value Measurement [Member] | Commitments to Extend Credit [Member]    
Off-balance-sheet instruments    
Off-balance sheet instruments 0 0
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value Measurement [Member] | Interest Rate Lock Commitments [Member]    
Off-balance-sheet instruments    
Off-balance sheet instruments 0 0
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member]    
Financial assets:    
Cash and cash equivalents 0 0
Federal Home Loan Bank stock 0 0
Federal Reserve Bank stock 0 0
Loans Receivable, Fair Value Disclosure 0 0
Accrued interest and dividends receivable 0 0
Mortgage servicing rights 0 0
Cash surrender value of life insurance 0 0
Financial liabilities:    
Non-maturing interest bearing deposits 317,044 277,416
Noninterest bearing deposits 0 0
Time certificates of deposit 0 0
Accrued expenses and other liabilities 0 0
Federal Home Loan Bank advances and other borrowings 0 0
Other long-term debt 0 0
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member] | Forward Contracts [Member]    
Off-balance-sheet instruments    
Off-balance sheet instruments 0 0
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member] | Commitments to Extend Credit [Member]    
Off-balance-sheet instruments    
Off-balance sheet instruments 0 0
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member] | Interest Rate Lock Commitments [Member]    
Off-balance-sheet instruments    
Off-balance sheet instruments 0 0
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member]    
Financial assets:    
Cash and cash equivalents 0 0
Federal Home Loan Bank stock 0 0
Federal Reserve Bank stock 0 0
Loans Receivable, Fair Value Disclosure 581,434 505,615
Accrued interest and dividends receivable 0 0
Mortgage servicing rights 8,411 7,312
Cash surrender value of life insurance 0 0
Financial liabilities:    
Non-maturing interest bearing deposits 0 0
Noninterest bearing deposits 0 0
Time certificates of deposit 159,867 142,202
Accrued expenses and other liabilities 0 0
Federal Home Loan Bank advances and other borrowings 95,137 82,579
Other long-term debt 23,641 24,209
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member] | Forward Contracts [Member]    
Off-balance-sheet instruments    
Off-balance sheet instruments 0 0
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member] | Commitments to Extend Credit [Member]    
Off-balance-sheet instruments    
Off-balance sheet instruments 0 0
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member] | Interest Rate Lock Commitments [Member]    
Off-balance-sheet instruments    
Off-balance sheet instruments $ 0 $ 0