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Note 10 - Goodwill and Other Intangible Assets (Details Textual) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Amortization of Intangible Assets, Total   $ 1,200 $ 1,200 $ 1,600
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months   700    
Finite-Lived Intangible Assets, Amortization Expense, Year Two   700    
Finite-Lived Intangible Assets, Amortization Expense, Year Three   700    
Finite-Lived Intangible Assets, Amortization Expense, Year Four   700    
Finite-Lived Intangible Assets, Amortization Expense, Year Five   700    
Goodwill, Impairment Loss   0 $ 0  
National Reporting Unit [Member]        
Goodwill, Impairment Loss   $ 0    
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount   18.00%    
Reporting Unit, Percentage of Parent Company Total Assets   4.00%    
Bayou City Pump Inc [Member]        
Goodwill, Impairment Loss $ 900     $ 900