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Note 1 - Summary of Significant Interim Accounting Policies - Adjustments to Retained Earnings (Details) - USD ($)
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Net sales $ 73,087,000 $ 60,987,000  
Cost of goods sold 48,212,000 38,773,000  
Selling and administrative expenses 21,182,000 17,429,000  
Income before taxes on income 3,320,000 5,405,000  
Income tax expense 870,000 $ 1,570,000  
Adjustment to opening retained earnings 95,296,000   $ 83,129,000
Difference between Revenue Guidance in Effect before and after Topic 606 [Member]      
Net sales 3,729,000    
Cost of goods sold 2,716,000    
Selling and administrative expenses 68,000    
Accounting Standards Update 2014-09 [Member]      
Net sales 3,700,000    
Accounting Standards Update 2014-09 [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member]      
Net sales 42,880,000    
Cost of goods sold 27,397,000    
Selling and administrative expenses 706,000    
Income before taxes on income 14,777,000    
Income tax expense 3,542,000    
Adjustment to opening retained earnings $ 11,235,000