Note 13 - Income Taxes - Schedule of Effective Income Tax Rate (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Income tax expense at federal statutory rate									$ 712	$ 892
Increase (decrease) resulting from:
Tax-exempt interest									(119)	(219)
Bank-owned life insurance									(66)	(109)
State income tax expense, net of federal income taxes									137	54
Tax Reform adjustment										2,471
Other									237	(54)
Total	$ 470	$ 269	$ 81	$ 81	$ 2,600	$ 173	$ 132	$ 130	$ 901	$ 3,035