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Note 2 - Revenue Recognition - Adoption of ASC 606 (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Jan. 01, 2018
Dec. 31, 2017
Property, plant and equipment $ 112,503   $ 112,503   $ 107,743 $ 106,716
Less accumulated depreciation and amortization (54,044)   (54,044)   (53,612) (53,064)
Net property, plant and equipment 58,459   58,459   54,131 53,652
Deferred revenue 3,918   3,918   871 297
Deferred income taxes 3,256   3,256   2,415 2,440
Retained earnings 107,392   107,392   97,492 $ 97,562
Net sales 47,808 $ 35,684 139,758 $ 110,623    
Cost of sales 35,377 27,491 104,156 82,973    
Gross profit 12,431 $ 8,193 35,602 $ 27,650    
Accounting Standards Update 2014-09 [Member]            
Property, plant and equipment         1,027  
Less accumulated depreciation and amortization         (548)  
Net property, plant and equipment         479  
Deferred revenue         574  
Deferred income taxes         (25)  
Retained earnings         $ (70)  
Calculated under Revenue Guidance in Effect before Topic 606 [Member]            
Property, plant and equipment 111,230   111,230      
Less accumulated depreciation and amortization (53,145)   (53,145)      
Net property, plant and equipment 58,085   58,085      
Deferred revenue 3,502   3,502      
Deferred income taxes 3,281   3,281      
Retained earnings 107,409   107,409      
Net sales     139,600      
Cost of sales     104,051      
Gross profit     35,549      
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member]            
Property, plant and equipment 1,273   1,273      
Less accumulated depreciation and amortization (899)   (899)      
Net property, plant and equipment 374   374      
Deferred revenue 416   416      
Deferred income taxes (25)   (25)      
Retained earnings $ (17)   (17)      
Net sales     158      
Cost of sales     105      
Gross profit     $ 53