Note 1. Business Description and Summary of Significant Accounting Policies - Textuals (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2023	Dec. 31, 2022	Jun. 30, 2023
Depreciation and amortization			$ 18,067	$ 15,608
Net income	$ 8,290	$ 10,720	$ 19,044	$ 20,229
Earnings Per Share, Diluted	$ 0.33	$ 0.43	$ 0.75	$ 0.81
Accounts Receivable, Extended Payment Terms			45 days
Accounts Receivable Sold Without Recourse			$ 198,900	$ 225,100
Factoring Fees	$ 800	$ 1,500	1,700	$ 2,400
Operating Lease, Right-of-Use Asset	2,900		2,900		$ 2,600
Operating Lease, Liability	2,900		2,900		2,600
Tax Cuts and Jobs Act, Transition Tax for Accumulated Foreign Earnings, Liability	5,900		5,900		7,800
Tax Cuts and Jobs Act, Transition Tax for Accumulated Foreign Earnings, Liability, Current	2,600		2,600
Goodwill	12,011		12,011		12,011
Accounts Receivable, Allowance for Credit Loss, Noncurrent	2,000		2,000
Receivables, net of allowances of $222 and $257, respectively	309,702		309,702		$ 308,167
Accounts Receivable, Credit Loss Expense (Reversal)	2,000
NES
Receivables, net of allowances of $222 and $257, respectively	2,300		2,300
Accounts Receivable, after Allowance for Credit Loss, Noncurrent	$ 2,900		$ 2,900
Minimum
Accounts Receivable, Customary Payment Terms			30 days
Maximum
Accounts Receivable, Customary Payment Terms			45 days