Note 2 - Business Combinations - Pro Forma Information (Details) - Great State Bank [Member] $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($) $ / shares shares
Net interest income	$ 24,262
Net income (a)	$ 4,508	[1]
Basic and diluted weighted average shares outstanding (b) (in shares) | shares	6,213,275	[2]
Basic and diluted earnings per common share (in dollars per share) | $ / shares	$ 1.07

[1] Supplemental pro forma net income includes the impact of certain fair value adjustments. Supplemental pro forma net income does not include assumptions on cost savings or the impact of merger-related expenses.

[2] Weighted average shares outstanding includes the full effect of the common stock issued in connection with the Great State acquisition as of the earliest reporting date.