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Note 9 - Acquisition of Businesses - Purchase Price (Details) - USD ($)
$ in Thousands
9 Months Ended
May 02, 2018
Dec. 01, 2017
Mar. 08, 2016
Sep. 30, 2018
Sep. 30, 2017
Cash consideration at closing, net of cash acquired       $ 85,597 $ 766
CID Resources [Member]          
Payments to Acquire Businesses, Gross $ 84,430        
Superior common stock issued 3,763        
Cash and working capital adjustment 2,521        
Business Combination, Consideration Transferred, Total $ 90,714        
BAMKO [Member]          
Payments to Acquire Businesses, Gross     $ 15,200    
Superior common stock issued     4,558    
Business Combination, Consideration Transferred, Total     24,924    
Cash consideration at closing, net of cash acquired     15,161    
Contingent consideration     $ 5,205    
Tangerine [Member]          
Payments to Acquire Businesses, Gross   $ 7,200      
Superior common stock issued   1,657      
Business Combination, Consideration Transferred, Total   12,088      
Cash consideration at closing, net of cash acquired   7,222      
Contingent consideration   $ 3,209