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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 |  |

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