Note 20 - Regulatory Capital (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Common Equity Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets	4.50%
Captial Conversion Buffer	2.50%
Common Equity Tier One Risk Based Capital with Conversion Buffer, Exceeding Thresholds	0.50%
Cash and Cash Equivalents, at Carrying Value	$ 66,970	$ 68,407	$ 51,192	$ 58,422
Advances from Subsidiaries Limited to as Percentage of Bank Tier One and Two Capital	10.00%
Public Offering [Member]
Cash and Cash Equivalents, at Carrying Value	$ 24,000