Note 11 - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Deferred tax assets
Allowance for loan losses	$ 1,647	$ 2,514
Net unrealized holding losses on investment securities available-for-sale	1,255	1,852
Impaired securities	0	448
Non-credit OTTI on investment securities available-for-sale	45	84
Non-accrual interest income	324	545
Deferred rent	55	80
Deferred revenue	80	131
Incurred but not reported (IBNR) medical expense	18	42
Depreciation	0	68
Bonus	130	68
Other	16	27
Total deferred tax assets	3,570	5,859
Deferred tax liabilities
Depreciation	24	0
Mortgage servicing rights	101	169
Net unrealized holding gains on trading investment securities	21	34
Prepaid expenses	95	168
Other	10	15
Total deferred tax liabilities	251	386
Net deferred tax asset	$ 3,319	$ 5,473