Note 11 - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Deferred tax assets
Allowance for loan losses	$ 2,514	$ 2,568
Net unrealized holding losses on investment securities available-for-sale	1,852	193
Impaired securities	448	463
Non-credit OTTI on investment securities available-for-sale	84	88
Non-accrual interest income	545	489
Deferred rent	80	73
Deferred revenue	131	114
Incurred but not reported (IBNR) medical expense	42	43
Depreciation	68	4
Bonus	68	0
Other	27	38
Total deferred tax assets	5,859	4,073
Deferred tax liabilities
Mortgage servicing rights	169	171
Net unrealized holding gains on trading investment securities	34	0
Prepaid expenses	168	193
Other	15	36
Total deferred tax liabilities	386	400
Net deferred tax asset	$ 5,473	$ 3,673