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Note 1 - Summary of Accounting Policies (Details Textual) - USD ($) shares in Thousands, $ in Millions | 12 Months Ended |
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2017 | Jul. 01, 2019
Capitalized Computer Software, Amortization | $ 1.4 | $ 1.2 | $ 0.5 |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | 3 years |  |  |
Effective Income Tax Rate Before Discretion, at Federal Statutory Income Tax Rate, Percent | 21.00% | 28.00% |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | 0 | 0 | 0 |
Subsequent Event [Member] | Accounting Standards Update 2014-09 [Member] | Minimum [Member] |  |  |  |
Operating Lease, Liability, Total |  |  |  | $ 40.0
Operating Lease, Right-of-Use Asset |  |  |  | 40.0
Subsequent Event [Member] | Accounting Standards Update 2014-09 [Member] | Maximum [Member] |  |  |  |
Operating Lease, Liability, Total |  |  |  | 45.0
Operating Lease, Right-of-Use Asset |  |  |  | $ 45.0
Selling, General and Administrative Expenses [Member] |  |  |  |
Advertising Expense | $ 3.6 | $ 3.4 | $ 3.8 |
Research and Development Expense, Total | $ 6.6 | 4.5 | $ 4.0 |
Revenue Benchmark [Member] |  |  |  |
Concentration Risk, Threshold Percentage | 5.00% |  |  |
Customer Concentration Risk [Member] | Revenue Benchmark [Member] |  |  |  |
Number of Major Customers | 0 |  |  |
Horizon Scientific Inc. [Member] |  |  |  |
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High | $ 5.6 |  |  |
Piazza Rosa Group [Member] |  |  |  |
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High | 1.7 |  |  |
Other Noncurrent Assets [Member] |  |  |  |
Trading Securities, Cost | $ 2.4 | $ 2.4 |  |

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