Note 10 - Income Taxes (Details) - Deferred Tax Assets and Liabilities - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Assets
Allowance for loan losses	$ 3,625	$ 4,904
Deferred directors’ fees	242	253
Postretirement benefit obligations	5,665	5,164
Other real estate owned	1,968	2,418
Partnership investments	0	372
Self-funded insurance	230	214
Paid time off	756	723
Depreciation	1,440	1,163
Intangibles	2,432	2,813
Other	307	399
Total deferred tax assets	16,665	18,423
Liabilities
Unrealized gains on available for sale investment securities, net	1,734	2,786
Prepaid expenses	306	459
Federal Home Loan Bank stock dividends	1,035	1,087
Deferred loan fees	806	816
Lease financing operations	0	51
Partnership investments	65	0
Total deferred tax liabilities	3,946	5,199
Net deferred tax asset	$ 12,719	$ 13,224