Note 21 - Commitments - (Details Textual) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Operating Leases, Rent Expense	$ 1.5	$ 1.4	$ 1.2
Federal Home Loan Bank Advances [Member]
Letters of Credit Outstanding, Amount	81.0	$ 76.0
Letter of Credit of $11 million expires in March 2017 [Member]
Letters of Credit Outstanding, Amount	11.0
Letter of Credit of $5.0 million expires in May 2017 [Member]
Letters of Credit Outstanding, Amount	5.0
Letter of Credit of $40 million expires in June 2017 [Member]
Letters of Credit Outstanding, Amount	40.0
Letter of Credit of $25 million expires in June 2017 [Member]
Letters of Credit Outstanding, Amount	$ 25.0
Minimum [Member]
Non-cancelable Operating Lease Terms		4 years
Maximum [Member]
Non-cancelable Operating Lease Terms		10 years