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Note H - Goodwill and Other Intangible Assets (Details Textual)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Amortization of Intangible Assets   $ 1,700 $ 1,500 $ 1,400
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months $ 1,400 1,400    
Goodwill, Impairment Loss   1,800 $ 0 $ 0
Finite-Lived Intangible Assets, Amortization Expense, Year Two 1,400 1,400    
Finite-Lived Intangible Assets, Amortization Expense, Year Three 1,400 1,400    
Finite-Lived Intangible Assets, Amortization Expense, Year Four 1,400 1,400    
Finite-Lived Intangible Assets, Amortization Expense, Year Five $ 1,400 $ 1,400    
National Pump Company [Member]        
Number of Reporting Units 2      
National Reporting Unit [Member]        
Reporting Unit, Percentage of Parent Company Total Assets 3.50% 3.50%    
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount 9.00% 9.00%    
Bayou City Pump Inc [Member]        
Reporting Unit, Percentage of Parent Company Total Assets 0.20% 0.20%    
Goodwill, Impairment Loss   $ 1,800