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Note 2 - Acquisitions - Components of Fair Value of Acquisitions and Allocation of Purchase Price For Acquisition of Piazza Rosa Group (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended 15 Months Ended
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2018
Dec. 31, 2017
Sep. 30, 2018
Dec. 31, 2018
Jun. 30, 2018
Payments to Acquire Businesses, Net of Cash Acquired, Total       $ 95,918 $ 10,397      
Goodwill, Ending Balance       261,569     $ 261,569 $ 211,751
Piazza Rosa Group [Member]                
Total cash consideration $ 10,056           10,056  
Fair value of contingent consideration   $ 2,800     $ 2,600 2,617  
Fair value of contingent consideration             2,617  
Payments to Acquire Businesses, Net of Cash Acquired, Total 10,056 $ 900 10,100       12,673  
Total             2,617  
Other acquired assets 2,678   2,678 4,342     4,342  
Other acquired assets             1,664  
Inventories 637   637 635     635  
Inventories             (2)  
Property, plant, & equipment 5,005   5,005 5,563     5,563  
Property, plant, & equipment             558  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total 4,087   4,087 3,472     3,472  
Identifiable intangible assets             (615)  
Goodwill, Ending Balance 6,218 $ 7,100 6,218 7,076   $ 7,100 7,076  
Goodwill             858  
Liabilities assumed (7,387)   (7,387) (7,387)     (7,387)  
Liabilities assumed              
Deferred taxes (1,182)   (1,182) (1,028)     (1,028)  
Deferred taxes             154  
Total $ 10,056   $ 10,056 $ 12,673     12,673  
Total             $ 2,617