Note 18 - Acquisition of Business - Purchase Price (Details) - USD ($) $ in Thousands			12 Months Ended
	Dec. 01, 2017	Mar. 08, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash consideration at closing, net of cash acquired			$ 7,988	$ 15,161
BAMKO [Member]
Cash consideration at closing, net of cash acquired		$ 15,161
Restricted shares of Superior common stock issued		4,558
Contingent consideration		5,205
Business Combination, Consideration Transferred		$ 24,924
Tangerine [Member]
Cash consideration at closing, net of cash acquired	$ 7,222
Restricted shares of Superior common stock issued	1,657
Contingent consideration	3,209
Business Combination, Consideration Transferred	$ 12,088