Note 8 - Income Taxes (Details) - Deferred Tax Assets and Deferred Tax Liabilities - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Deferred Tax Assets and Deferred Tax Liabilities [Abstract]
Allowance for loan loss	$ 8,029	$ 8,929
Deferred compensation	5,730	5,442
Accrued expenses	1,515	1,854
Investments in partnerships	1,177	1,031
Write-downs and costs associated with other real estate owned	435	491
Loans	659	678
Other-than-temporary impairment	347	310
Other assets	187	219
Total deferred tax assets	18,079	18,954
Securities	1,655	2,594
Property and equipment	1,158	1,250
Loan costs	843	756
Prepayment penalty on modification of FHLB advances		76
Mortgage servicing rights	315	356
Leases	611	422
Core deposit intangible	573	652
Other liabilities	473	430
Total deferred tax liabilities	5,628	6,536
Valuation allowance	86	41
Net deferred tax asset	$ 12,365	$ 12,377