Note 20 - Parent Company Only Financial Statements - Condensed Statements of Cash Flows (Details) (Parentheticals) - shares		3 Months Ended	12 Months Ended
	May 13, 2015	Jun. 30, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Proceeds from issuance of common stock, net of issuance costs, shares (in shares)		1,215,000
Common Stock Offering 1 [Member]
Proceeds from issuance of common stock, net of issuance costs, shares (in shares)	3,680,000			3,680,000
Common Stock Offering 2 [Member]
Proceeds from issuance of common stock, net of issuance costs, shares (in shares)			1,215,000
Parent Company [Member] | Series F Noncumulative Perpetual Preferred Stock [Member]
Redemption of Series F Non-cumulative Perpetual Preferred Stock, shares (in shares)					29,867
Parent Company [Member] | Common Stock Offering 1 [Member]
Proceeds from issuance of common stock, net of issuance costs, shares (in shares)				3,680,000
Parent Company [Member] | Common Stock Offering 2 [Member]
Proceeds from issuance of common stock, net of issuance costs, shares (in shares)			1,215,000