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Note 1 - Summary of Accounting Policies (Details Textual)
shares in Thousands, $ in Thousands
 12 Months Ended
Jun. 30, 2024
USD ($)
shares
Jun. 30, 2023
USD ($)
Jun. 30, 2022
USD ($)
Debt Securities, Trading $ 4,900 $ 3,700  
Equity Securities without Readily Determinable Fair Value, Amount 2,000    
Payments to Acquire Debt Securities, Available-for-Sale 2,700    
Income Tax Expense (Benefit) $ 21,532 $ 24,796 $ 19,807
Effective Income Tax Rate Reconciliation, Percent 22.60% 15.10% 24.40%
Effective Income Tax Rate Reconciliation, Mix of Income in Various Jurisdictions $ 3,100 $ (4,300) $ 4,300
Effective Income Tax Rate Reconciliation, Tax Credit, Amount 2,800 14,300  
Effective Income Tax Rate Reconciliation, Tax Credit, Foreign, Amount 700 11,600  
Effective Income Tax Rate Reconciliation, Tax Credit, Research, Amount 2,100 2,700 2,200
Effective Income Tax Rate Reconciliation, Officer Compensation, Amount 3,800    
Effective Income Tax Rate Reconciliation, Tax Expense (Benefit), Share-Based Payment Arrangement, Amount $ (3,900)    
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount   11,300  
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount   5,000  
Effective Income Tax Rate Reconciliation, Return-to-accrual Adjustments to True-up Up Prior-period Provision Amounts     1,300
Effective Income Tax Rate Reconciliation, Release of Uncertain Tax Provision Reserves     1,000
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) | shares 0    
Selling, General and Administrative Expenses [Member]      
Advertising Expense $ 2,400 2,700 2,300
Research and Development Expense $ 20,500 $ 17,200 $ 12,200
Revenue Benchmark [Member]      
Concentration Risk, Threshold Percentage 5.00%    
Customer Concentration Risk [Member] | Revenue Benchmark [Member]      
Number of Major Customers 0    
Fair Value, Inputs, Level 3 [Member] | Maximum [Member]      
Equity Securities, FV-NI, Unrealized Gain (Loss) $ 100    
GS Engineering [Member]      
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High 0    
Sanyu Electric Pte Ltd [Member]      
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High $ 700