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Note 1 - Summary of Accounting Policies (Details Textual) - USD ($) shares in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Jun. 30, 2018 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2016
Capitalized Computer Software, Amortization |  |  | $ 1,400,000 | $ 600,000 | $ 600,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  | 3 years |  |
Income Tax Expense (Benefit), Total |  |  | $ 40,620,000 | $ 15,355,000 | $ 16,295,000
Effective Income Tax Rate Reconciliation, Percent, Total |  |  | 52.60% | 24.80% | 23.80%
Effective Income Tax Rate Reconciliation, Section 965 Toll Tax, Amount |  |  | $ 11,700,000 |  |
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability |  | $ 56,000 | 1,340,000 |  |
Effective Income Tax Rate Reconciliation, Anticipated Cash Repatriation, Amount |  |  | $ 7,800,000 |  |
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amount, Total |  |  |  | $ 400,000 |
Effective Income Tax Rate Reconciliation, Tax Credit, Research, Amount |  |  |  | 600,000 | $ 700,000
Effective Income Tax Rate Reconciliation, Income Tax Rate Differential, Other Jurisdictions, Amount |  |  |  | $ (5,300,000) | (4,900,000)
Effective Income Tax Rate Reconciliation, Disposition of Asset, Amount |  |  |  |  | $ (900,000)
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount |  |  | 0 | 0 | 0
Retained Earnings (Accumulated Deficit), Ending Balance |  | $ 761,430,000 | $ 761,430,000 | $ 716,605,000 |
Cost of Goods and Services Sold, Total |  |  | 566,581,000 | 502,504,000 | $ 499,333,000
Accounting Standards Update 2018-02 [Member] |  |  |  |  |
Tax Cuts and Jobs Act, Reclassification from AOCI to Retained Earnings, Tax Effect |  |  | 17,200,000 |  |
Scenario, Forecast [Member] | Accounting Standards Update 2014-09 [Member] |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | $ 1,500,000 |  |  |  |
Scenario, Forecast [Member] | Accounting Standards Update 2014-09 [Member] | Engineering Technologies Group [Member] |  |  |  |  |
Retained Earnings (Accumulated Deficit), Ending Balance | 100,000 |  |  |  |
Cost of Goods and Services Sold, Total | 600,000 |  |  |  |
Scenario, Forecast [Member] | Accounting Standards Update 2014-09 [Member] | Transferred over Time [Member] | Engineering Technologies Group [Member] |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | $ 700,000 |  |  |  |
Selling, General and Administrative Expenses [Member] |  |  |  |  |
Advertising Expense |  |  | 4,300,000 | 5,100,000 | 4,300,000
Research and Development Expense, Total |  |  | 6,100,000 | 5,500,000 | 4,900,000
20% Owned Equity Interest, Equity Method [Member] |  |  |  |  |
Payments to Suppliers |  |  | $ 2,400,000 | $ 2,400,000 | $ 3,300,000
Equity Method Investment, Ownership Percentage |  | 20.00% | 20.00% | 20.00% | 20.00%
Sales Revenue, Net [Member] |  |  |  |  |
Concentration Risk, Threshold Percentage |  |  | 5.00% |  |
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] |  |  |  |  |
Number of Major Customers |  |  | 0 |  |
Horizon Scientific Inc. [Member] |  |  |  |  |
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High |  | $ 8,000,000 | $ 8,000,000 |  |
Piazza Rosa Group [Member] |  |  |  |  |
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High |  | 1,700,000 | 1,700,000 |  |
Other Noncurrent Assets [Member] |  |  |  |  |
Trading Securities, Cost |  | $ 2,400,000 | $ 2,400,000 | $ 2,400,000 |

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