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Note 1 - Summary of Accounting Policies (Details Textual) $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Aug. 31, 2022 USD ($) | Jun. 30, 2022 USD ($) | Sep. 30, 2021 USD ($) | Jun. 30, 2022 USD ($) shares | Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($) shares | Dec. 31, 2021 USD ($)
Payment for Contingent Consideration Liability, Financing Activities |  |  |  |  | $ 2,167 | $ 356 | $ 872 |
Business Combination, Contingent Consideration, Liability, Total | [1] |  | $ 1,167 |  | 1,167 |  |  | $ 3,333
Income Tax Expense (Benefit), Total |  |  |  |  | $ 19,807 | $ 14,157 | $ 13,060 |
Effective Income Tax Rate Reconciliation, Percent, Total |  |  |  |  | 24.40% | 26.90% | 24.30% |
Effective Income Tax Rate Reconciliation, Mix of Income in Various Jurisdictions |  |  |  |  | $ 4,300 | $ 5,100 | $ 1,400 |
Effective Income Tax Rate Reconciliation, Tax Credit, Research, Amount |  |  |  |  | 2,200 | 800 | 1,200 |
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 | 1,700 | 700 |
Effective Income Tax Rate Reconciliation, Disposition of Business, Amount |  |  |  |  |  | 1,200 |  |
Effective Income Tax Rate Reconciliation, GILTI |  |  |  |  |  |  | $ 800 |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) | shares |  |  |  |  | 0 |  | 32,000 |
Tax Years 2019 and 2020 [Member] |  |  |  |  |  |  |  |
Income Tax Expense (Benefit), CARES Act |  |  |  |  |  | (1,000) |  |
Selling, General and Administrative Expenses [Member] |  |  |  |  |  |  |  |
Advertising Expense |  |  |  |  | $ 2,300 | 1,700 | $ 1,300 |
Research and Development Expense, Total |  |  |  |  | $ 12,200 | 9,600 | $ 6,900 |
Revenue Benchmark [Member] |  |  |  |  |  |  |  |
Concentration Risk, Threshold Percentage |  |  |  |  | 5.00% |  |  |
Customer Concentration Risk [Member] | Revenue Benchmark [Member] |  |  |  |  |  |  |  |
Number of Major Customers |  |  |  |  | 0 |  |  |
GS Engineering [Member] |  |  |  |  |  |  |  |
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High |  |  | 12,800 |  | $ 12,800 |  |  |
Renco Electronics [Member] |  |  |  |  |  |  |  |
Payment for Contingent Consideration Liability, Financing Activities |  |  | 1,000 | $ 1,200 |  |  |  |
Business Combination, Contingent Consideration, Liability, Total |  |  | 3,400 |  | 3,400 |  |  |
Renco Electronics [Member] | Forecast [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |
Payment for Contingent Consideration Liability, Financing Activities |  | $ 1,200 |  |  |  |  |  |
Other Noncurrent Assets [Member] |  |  |  |  |  |  |  |
Debt Securities, Trading |  |  | $ 3,000 |  | $ 3,000 | $ 3,000 |  |
[1] | The fair value of our contingent consideration arrangement is determined based on our evaluation as to the probability and amount of any deferred compensation that has been earned to date.

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