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Note 1 - Summary of Accounting Policies (Details Textual) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2023
Debt Securities, Trading | $ 5,000 | $ 4,900 |
Equity Securities without Readily Determinable Fair Value, Amount |  | 2,000 |
Payments to Acquire Debt Securities, Available-for-Sale |  | $ 2,700 |
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ 1.5 | $ 1.5 |
Common Stock, Shares Authorized (in shares) | 60,000,000 | 60,000,000 |
Common Stock, Shares, Issued (in shares) | 27,984,278 | 27,984,278 |
Common Stock, Shares, Outstanding (in shares) | 11,992,116 | 11,761,700 |
Treasury Stock, Common, Shares (in shares) | 15,992,162 | 16,222,578 |
Treasury Stock, Shares, Acquired (in shares) | 31,308 |  |
Stock Issued During Period, Shares, Acquisitions (in shares) | 152,299 |  |
Stock Issued During Period, Shares, Employee Stock Purchase Plans (in shares) | 109,425 |  |
Income Tax Expense (Benefit) | $ 11,084 | $ 21,532 | $ 24,796
Effective Income Tax Rate Reconciliation, Percent | 16.10% | 22.60% | 15.10%
Effective Income Tax Rate Reconciliation, Mix of Income in Various Jurisdictions | $ 5,700 | $ 3,100 | $ (4,300)
Effective Income Tax Rate Reconciliation, Tax Credit, Amount | 4,600 | 2,800 | 14,300
Effective Income Tax Rate Reconciliation, Tax Credit, Foreign, Amount | 2,100 | 700 | 11,600
Effective Income Tax Rate Reconciliation, Tax Credit, Research, Amount | 2,500 | 2,100 | 2,700
Effective Income Tax Rate Reconciliation, Officer Compensation, Amount | 1,800 | 3,800 |
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount | 3,000 |  | 11,300
Effective Income Tax Reconciliation, Release of Uncertain Tax Position | 9,100 |  |
Effective Income Tax Reconciliation, Release of Uncertain Tax Position, Interest | 1,200 |  |
Effective Income Tax Rate Reconciliation, Tax Expense (Benefit), Share-Based Payment Arrangement, Amount | $ 900 | $ (3,800) |
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount |  |  | $ 5,000
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) | 0 | 0 | 0
Selling, General and Administrative Expenses [Member] |  |  |
Advertising Expense | $ 2,600 | $ 2,400 | $ 2,700
Research and Development Expense | $ 21,200 | 20,500 | $ 17,200
Revenue Benchmark [Member] |  |  |
Concentration Risk, Threshold Percentage | 5.00% |  |
Sanyu Electric Pte Ltd [Member] |  |  |
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High |  | $ 700 |

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