Note 14 - Income Taxes (Details) - Reconciliation of Income Tax Expense - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014
Reconciliation of Income Tax Expense [Abstract]
Provision at federal statutory tax rate									$ 2,440	$ 2,692
State income tax-net of federal tax benefit									107	170
Change in state statutory tax rate									(4)	15
Tax-exempt interest income									(405)	(422)
Bank-owned life insurance income									(83)	(95)
Captive insurance net premiums									(322)	(57)
Nondeductible acquisition expense									219	0
Other									12	9
Totals	$ 501	$ 507	$ 487	$ 469	$ 450	$ 611	$ 692	$ 559	$ 1,964	$ 2,312
Effective tax rate									27.40%	29.20%