Note 3 - Loans Receivable and Related Allowance for Loan Losses (Details Textual)	12 Months Ended
Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Loans and Leases Receivable, Deferred Income, Total	$ 2,200,000	$ 1,500,000
Loans and Leases Receivable, Allowance, Ending Balance	6,508,000	6,127,000	$ 5,545,000
Financing Receivable, Modifications, Recorded Investment	394,000	433,000
Allowance for Losses Allocated to Loans Classified as TDRS	$ 12,000	$ 7,000
Financing Receivable, Modifications, Number of Contracts	0
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	0
Residential Portfolio Segment [Member]
Loans and Leases Receivable, Allowance, Ending Balance	$ 2,198,000	$ 2,090,000	$ 1,846,000
Financing Receivable, Modifications, Recorded Investment		323,000
Allowance for Losses Allocated to Loans Classified as TDRS		$ 0
Financing Receivable, Modifications, Number of Contracts		1
Community First [Member]
Loans and Leases Receivable, Allowance, Ending Balance	0	$ 0
Northern Hancock [Member]
Loans and Leases Receivable, Allowance, Ending Balance	$ 0	$ 0

Allowance for losses allocated to loans classified as TDRs as at the reporting date

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Number of financing receivables that have been modified by troubled debt restructurings.

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The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings.

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Number of financing receivables that have been modified by troubled debt restructurings within the previous 12 months and for which there was a payment default.

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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Amount of deferred interest and fee income, unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of acquired loans. Excludes amounts for loans and leases covered under loss sharing agreements.

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