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Acquisitions - Pro forma information and acquisition cost (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Jul. 01, 2019
Mar. 31, 2020
Sep. 30, 2019
Mar. 31, 2019
Dec. 31, 2019
Jun. 19, 2019
Pro forma information            
Revenue   $ 71,655     $ 81,982  
Income (loss) before income taxes   4,034   $ (15,829) $ (15,829)  
Acquisition related cost       400    
Selling, general, and administrative expenses            
Pro forma information            
Acquisition related cost   $ 8,000        
Superior            
Pro forma information            
Revenue, if acquired beginning of the year       85,129    
Income before taxes, if acquired beginning of the year       $ (13,289)    
Revenue     $ 3,600      
Income (loss) before income taxes     $ 1,600      
Goodwill expected to be deductible for tax purposes           $ 6,900
Pro Petro            
Pro forma information            
Purchase price $ 5,000