Note 8 - Income Taxes - Deferred Tax Assets and Deferred Tax Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Allowance for loan and lease loss	$ 5,567	$ 5,422
Deferred compensation	4,703	4,148
Accrued expenses	968	798
Securities	756	121
Investments in tax credit partnerships	543	565
Loans	434	442
Other assets	181	186
Write-downs and costs associated with OREO	7	39
Total deferred tax assets	13,159	11,721
Property and equipment	1,154	764
Loan costs	632	588
Leases	336	149
Other liabilities	267	260
Core deposit intangible	230	267
Mortgage servicing rights	193	161
Total deferred tax liabilities	2,812	2,189
Valuation allowance	(154)	(326)
Net deferred tax asset	$ 10,193	$ 9,206