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Note I - Business Segment Information (Details) - Net Sales from External Customers by Product Category (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Segment Reporting Information [Line Items]      
Net Sales $ 391,665 $ 375,691 $ 359,490
Pumps And Pump Systems [Member]
     
Segment Reporting Information [Line Items]      
Net Sales 336,779 318,235 303,479
Repairs and Other [Member]
     
Segment Reporting Information [Line Items]      
Net Sales $ 54,886 $ 57,456 $ 56,011