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Note 2. Acquisition (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Oct. 01, 2018
Dec. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Jun. 30, 2018
Business Acquisition [Line Items]          
Goodwill   $ 10,841 $ 10,841   $ 6,191
Payments to Acquire Businesses, Net of Cash Acquired     $ 43,889 $ 0  
GES          
Business Acquisition [Line Items]          
Business Combination, Tax Liabilities Including Interest and Penalties Assumed, Liabilities $ 4,200        
Business Combination, Tax Liabilities Including Interest and Penalties Assumed, Noncurrent Liabilities 3,900        
Business Combination, Tax Liabilities Including Interest and Penalties Assumed, Current Liabilities 300        
Business Combination, Indemnification Assets, Amount as of Acquisition Date 4,200        
Business Acquisition, Date of Acquisition Agreement     Oct. 01, 2018    
Cash Acquired from Acquisition     $ 2,300    
Business Acquisition, Transaction Costs   1,100 1,100    
Business Combination, Acquisition Related Costs   100 200    
Receivables 19,947        
Inventories 8,044        
Prepaid expenses and other current assets 1,424        
Property and Equipment 9,100        
Other Intangible Assets 19,259        
Other Assets 553        
Goodwill 4,650        
Total assets acquired 62,977        
Borrowings under Credit Facilities 12,843        
Accounts payable 5,186        
Accrued expenses 940        
Other long-term liabilities 3,884        
Total liabilities assumed 22,853        
Net assets acquired 40,124        
Business Combination, Consideration Transferred     40,100    
Nontrade Receivables, Current   $ 7,600 7,600    
Payments to Acquire Businesses, Net of Cash Acquired     43,900    
Nontrade Receivables, Current | GES          
Business Acquisition [Line Items]          
Business Combination, Consideration Transferred, Other     $ 3,800    
Computer Software, Intangible Asset | GES          
Business Acquisition [Line Items]          
Finite-lived Intangible Assets Acquired $ 379        
Computer Software, Intangible Asset | Minimum | GES          
Business Acquisition [Line Items]          
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 3 years        
Computer Software, Intangible Asset | Maximum | GES          
Business Acquisition [Line Items]          
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 7 years        
Technology-Based Intangible Assets | GES          
Business Acquisition [Line Items]          
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 5 years        
Finite-lived Intangible Assets Acquired $ 5,060        
Trade Names | GES          
Business Acquisition [Line Items]          
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 10 years        
Finite-lived Intangible Assets Acquired $ 6,369        
Customer Relationships | GES          
Business Acquisition [Line Items]          
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 15 years        
Finite-lived Intangible Assets Acquired $ 7,451