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Note 1. Business Description and Summary of Significant Accounting Policies - Revenue Recognition Topic 606 Adoption (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Jul. 01, 2018
Jun. 30, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]            
Contract assets $ 49,629   $ 49,629   $ 43,241 $ 0
Inventories 207,006   207,006   162,427 201,596
Other Assets 25,563   25,563   23,123 23,994
Accrued expenses 33,846   33,846   32,597 32,446
Retained earnings 114,608   114,608   102,424 $ 99,374
Net Sales 284,149 $ 258,151 549,769 $ 511,355    
Cost of Sales 263,705 237,230 511,139 470,981    
Gross Profit 20,444 20,921 38,630 40,374    
Operating Income (Loss) 10,212 10,119 17,244 19,642    
Income Before Taxes on Income 8,619 10,586 15,097 21,421    
Provision for Income Taxes 1,504 18,933 2,913 21,288    
Net income $ 7,115 $ (8,347) $ 12,184 $ 133    
Earnings Per Share, Diluted $ 0.27 $ (0.31) $ 0.46 $ 0.00    
Earnings Per Share, Basic $ 0.27 $ (0.31) $ 0.46 $ 0.00    
Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606            
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]            
Contract assets $ 49,629   $ 49,629   43,241  
Inventories (45,248)   (45,248)   (39,169)  
Other Assets 0   0   (871)  
Accrued expenses 1,075   1,075   151  
Retained earnings 3,306   3,306   $ 3,050  
Net Sales 6,010   6,388      
Cost of Sales 5,785   6,070      
Gross Profit 225   318      
Operating Income (Loss) 225   318      
Income Before Taxes on Income 225   318      
Provision for Income Taxes 60   62      
Net income $ 165   $ 256      
Earnings Per Share, Diluted $ 0   $ 0.01      
Earnings Per Share, Basic $ 0   $ 0.01      
Accounting Standards Update 2014-09 | Calculated under Revenue Guidance in Effect before Topic 606            
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]            
Contract assets $ 0   $ 0      
Inventories 252,254   252,254      
Other Assets 25,563   25,563      
Accrued expenses 32,771   32,771      
Retained earnings 111,302   111,302      
Net Sales 278,139   543,381      
Cost of Sales 257,920   505,069      
Gross Profit 20,219   38,312      
Operating Income (Loss) 9,987   16,926      
Income Before Taxes on Income 8,394   14,779      
Provision for Income Taxes 1,444   2,851      
Net income $ 6,950   $ 11,928      
Earnings Per Share, Diluted $ 0.27   $ 0.45      
Earnings Per Share, Basic $ 0.27   $ 0.45