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Note 2 - Business Segment Information - Summarized Financial Information by Reportable Business Segments (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2014
Net sales | $ 83,409 | $ 78,843 | $ 92,305 | $ 87,466 | $ 83,419 | $ 78,156 | $ 85,658 | $ 84,159 | $ 80,844 | $ 70,740 | $ 84,687 | $ 85,925 | $ 342,023 | $ 331,392 | $ 322,196 | $ 307,857 | $ 299,463
Operating income (loss) |  |  |  |  |  |  |  |  |  |  |  |  | (21,652) | 3,609 | 13,956 | $ 7,533 | $ 2,318
Capital expenditures |  |  |  |  |  |  |  |  |  |  |  |  | 3,406 | 6,633 | 10,211 |  |
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  | 10,222 | 8,262 | 6,677 |  |
Corporate and Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating income (loss) |  |  |  |  |  |  |  |  |  |  |  |  | (14,475) | (12,946) | (10,591) |  |
Capital expenditures |  |  |  |  |  |  |  |  |  |  |  |  | 165 | 636 | 416 |  |
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  | 1,107 | 1,139 | 1,214 |  |
Lighting Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  | 260,613 | 258,997 | 244,228 |  |
Lighting Segment [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating income (loss) |  |  |  |  |  |  |  |  |  |  |  |  | (12,795) | 14,116 | 19,301 |  |
Capital expenditures |  |  |  |  |  |  |  |  |  |  |  |  | 2,203 | 4,249 | 6,107 |  |
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  | 7,573 | 5,649 | 4,359 |  |
Graphics Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  | 81,410 | 72,395 | 77,968 |  |
Graphics Segment [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating income (loss) |  |  |  |  |  |  |  |  |  |  |  |  | 5,618 | 2,439 | 5,246 |  |
Capital expenditures |  |  |  |  |  |  |  |  |  |  |  |  | 1,038 | 1,748 | 3,688 |  |
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,542 | $ 1,474 | $ 1,104 |  |

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