Note 15 - Stockholder Rights Plan (Details Textual)	12 Months Ended
	Dec. 31, 2016 $ / shares
Number of Preferred Stock Purchase Right Granted Per Common Share	1
Beneficial Ownership Threshold	15.00%
Class of Warrant or Right, Exercise Price of Warrants or Rights	$ 100
Percentage of Discount on Then Current Market Value	50.00%
Redemption Rate Per Right	$ 0.005
Expiration of Rights After Separation From Common Shares	3 years