Note 18 - Acquisition of Businesses - Purchase Price (Details) - USD ($) $ in Thousands			12 Months Ended
	May 02, 2018	Dec. 01, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash consideration at closing				$ 85,597	$ 7,988
CID Resources [Member]
Payments to Acquire Businesses, Gross	$ 84,430
Superior common stock issued	3,763
Cash and working capital adjustment	2,521
Total Consideration	90,714
Business Combination, Consideration Transferred, Total	$ 90,714
Tangerine [Member]
Payments to Acquire Businesses, Gross		$ 7,200
Superior common stock issued		1,657
Total Consideration		12,088
Cash consideration at closing		7,222
Contingent consideration		3,209
Business Combination, Consideration Transferred, Total		$ 12,088