Note 17 - Stockholders' Equity (Details Textual) - USD ($)			3 Months Ended		14 Months Ended
	Nov. 21, 2016	Mar. 17, 2016	Dec. 31, 2016	Dec. 31, 2015	Sep. 30, 2016	Dec. 17, 2015	Aug. 11, 2015
Dividends			$ 0	$ 0
Treasury Stock, Value, Acquired, Cost Method				$ 7,180,000
Mangrove [Member]
Mutual Confidentiality Agreement, Extended Period	30 days
Shares Repurchase Plan [Member]
Stock Repurchase Program, Authorized Amount		$ 15,000,000					$ 15,000,000
Stock Repurchase Program, Additional Authorized Repurchase Amount						$ 15,000,000
Treasury Stock, Value, Acquired, Cost Method		$ 9,900,000			$ 10,100,000
Treasury Stock, Shares, Acquired					1,186,000