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Note 1 - Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Jun. 30, 2019
Notes Tables |
Disaggregation of Revenue [Table Text Block] |
|  | Twelve Months Ended |
( In thousands) |  | June 30, 2019 |
|  | Lighting Segment |  |  | Graphics Segment |
Timing of revenue recognition |  |  |  |  |  |  |  |
Products and services transferred at a point in time |  | $ | 207,577 |  |  | $ | 54,866 |
Products and services transferred over time |  |  | 27,537 |  |  |  | 38,872 |
|  | $ | 235,114 |  |  | $ | 93,738 |
Type of Product and Services |  |  |  |  |  |  |  |
New technology products |  | $ | 203,049 |  |  | $ | 12,479 |
Legacy products |  |  | 29,592 |  |  |  | 59,867 |
Turnkey services and other |  |  | 2,473 |  |  |  | 21,392 |
|  | $ | 235,114 |  |  | $ | 93,738 |
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] |
(In thousands) |  | June 30, |  |  | June 30, |
|  | 201 9 |  |  | 2018 |
Accounts receivable |  | $ | 55,607 |  |  | $ | 51,018 |
Less: Allowance for doubtful accounts |  |  | (879 | ) |  |  | (409 | )
Accounts receivable, net |  | $ | 54,728 |  |  | $ | 50,609 |
Property, Plant and Equipment [Table Text Block] |
Buildings (in years) | 28 | - | 40
Machinery and equipment (in years) | 3 | - | 10
Computer software (in years) | 3 | - | 8
Schedule of Product Warranty Liability [Table Text Block] |
(In thousands) |  | June 30, 201 9 |  |  | June 30, 2018 |
Balance at beginning of the period |  | $ | 6,876 |  |  | $ | 7,560 |
Additions charged to expense |  |  | 5,190 |  |  |  | 5,181 |
Deductions for repairs and replacements |  |  | (4,379 | ) |  |  | (5,865 | )
Balance at end of the period |  | $ | 7,687 |  |  | $ | 6,876 |
Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block] |
( In thousands) |  | Balance as of June 30, 2018 |  |  | Adjustments |  |  | Opening Balance as of July 1, 2018 |
Assets: |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable, net |  | $ | 50,609 |  |  | $ | 4,935 |  |  | $ | 55,544 |
Inventories, net |  | $ | 50,994 |  |  | $ | (4,167 | ) |  | $ | 46,827 |
Other long-term assets, net |  | $ | 9,786 |  |  | $ | (177 | ) |  | $ | 9,609 |
Shareholders’ Equity: |  |  |  |  |  |  |  |  |  |  |  |
Retained earnings |  | $ | 15,124 |  |  | $ | 591 |  |  | $ | 15,715 |

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