Note 11 - Other Borrowings and Unused Lines of Credit - Summary of Prepayments of Wholesale Structured Repurchase Agreements (Details) - USD ($)	3 Months Ended				12 Months Ended
	Sep. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Jun. 30, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Amount					$ 69,769,000	$ 34,559,000
Whole sale Repurchase Agreements [Member]
Amount	$ 55,000,000	$ 10,000,000	$ 5,000,000	$ 10,000,000	$ 65,000,000	$ 15,000,000
Weighted Average Interest Rate	3.27%	3.97%	3.46%	4.40%	3.38%	4.09%
Prepayment Fees	$ 4,010,000	$ 759,000	$ 382,000	$ 1,202,000	$ 4,769,000	$ 1,584,000