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Note 8 - Goodwill and Other Intangible Assets (Details Textual) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Amortization of Intangible Assets $ 1,600 $ 1,700 $ 1,500
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 1,000    
Finite-Lived Intangible Assets, Amortization Expense, Year Two 1,000    
Finite-Lived Intangible Assets, Amortization Expense, Year Three 1,000    
Finite-Lived Intangible Assets, Amortization Expense, Year Four 1,000    
Finite-Lived Intangible Assets, Amortization Expense, Year Five 1,000    
Goodwill, Impairment Loss 925 1,800 $ 0
Customer Relationships [Member]      
Impairment of Intangible Assets, Finite-lived 3,200    
Bayou City Pump Inc [Member]      
Goodwill, Impairment Loss 900 $ 1,800  
National Reporting Unit [Member]      
Goodwill, Impairment Loss $ 0    
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount 7.00%    
Reporting Unit, Percentage of Parent Company Total Assets 3.00%