Note 3 - Loans and Allowance for Loan Losses - Troubled Debt Restructuring by Accrual Status (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Recorded investment in loans	$ 466,151	$ 439,855
Real Estate Mortgage Portfolio Segment [Member] \| Residential Loan [Member]
Recorded investment in loans	140,641	137,019
Real Estate Mortgage Portfolio Segment [Member] \| Commercial Real Estate Loan [Member]
Recorded investment in loans	112,082	107,672
Commercial Portfolio Segment [Member]
Recorded investment in loans	41,758	36,417
Nonperforming Financial Instruments [Member]
TDR accruing	876	703
TDR nonaccrual	637	673
Recorded investment in loans	1,513	1,376
TDR related allowance for loan losses	32	44
Nonperforming Financial Instruments [Member] \| Real Estate Mortgage Portfolio Segment [Member] \| Residential Loan [Member]
TDR accruing	145	295
TDR nonaccrual	290	302
Recorded investment in loans	435	597
TDR related allowance for loan losses
Nonperforming Financial Instruments [Member] \| Real Estate Mortgage Portfolio Segment [Member] \| Commercial Real Estate Loan [Member]
TDR accruing	529	190
TDR nonaccrual	347	371
Recorded investment in loans	876	561
TDR related allowance for loan losses	32	44
Nonperforming Financial Instruments [Member] \| Commercial Portfolio Segment [Member]
TDR accruing	202	218
TDR nonaccrual
Recorded investment in loans	202	218
TDR related allowance for loan losses

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 before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

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