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Note 1 - Summary of Significant Accounting Policies - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 12 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018
Revenue | $ 328,852 | $ 342,023
Lighting Segment [Member] |  |
Revenue | 235,114 | 260,613
Lighting Segment [Member] | New Technology Products [Member] |  |
Revenue | 203,049 |
Lighting Segment [Member] | Legacy Products [Member] |  |
Revenue | 29,592 |
Lighting Segment [Member] | Turnkey Services and Other [Member] |  |
Revenue | 2,473 |
Graphics Segment [Member] |  |
Revenue | 93,738 | $ 81,410
Graphics Segment [Member] | New Technology Products [Member] |  |
Revenue | 12,479 |
Graphics Segment [Member] | Legacy Products [Member] |  |
Revenue | 59,867 |
Graphics Segment [Member] | Turnkey Services and Other [Member] |  |
Revenue | 21,392 |
Transferred at Point in Time [Member] | Lighting Segment [Member] |  |
Revenue | 207,577 |
Transferred at Point in Time [Member] | Graphics Segment [Member] |  |
Revenue | 54,866 |
Transferred over Time [Member] | Lighting Segment [Member] |  |
Revenue | 27,537 |
Transferred over Time [Member] | Graphics Segment [Member] |  |
Revenue | $ 38,872 |

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- Definition Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045 + Details
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