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Note 3 - Segment Reporting Information (Details Textual) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Jun. 30, 2016
Number of Operating Segments |  |  | 3 |  |
Intangible Assets, Net (Excluding Goodwill) | $ 5,378,000 |  | $ 5,378,000 |  | $ 5,586,000
Revenue, Net | $ 85,658,000 | $ 84,687,000 | $ 169,817,000 | $ 170,612,000 |
Intersegment Revenue Markup Percentage |  |  | 10.00% |  |
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] |  |  |  |  |
Concentration Risk, Percentage | 0.00% | 0.00% | 0.00% | 0.00% |
Accounts Receivable [Member] | Customer Concentration Risk [Member] |  |  |  |  |
Concentration Risk, Percentage |  |  | 0.00% |  | 0.00%
Graphics Segment [Member] |  |  |  |  |
Revenue, Net | $ 20,582,000 | $ 21,206,000 | $ 39,476,000 | $ 43,536,000 |
Lighting Segment and Graphics Segment [Member] | Petroleum/Convenience Store Customer [Member] |  |  |  |  |
Revenue, Net |  |  |  | $ 17,045,000 |
Lighting Segment and Graphics Segment [Member] | Petroleum/Convenience Store Customer [Member] | Sales Revenue, Net [Member] | Customer Concentration Risk [Member] |  |  |  |  |
Concentration Risk, Percentage |  |  |  | 10.00% |
Customer Relationships [Member] | Graphics Segment [Member] |  |  |  |  |
Intangible Assets, Net (Excluding Goodwill) | $ 492,000 |  | 492,000 |  |
Reclassification of Operating Loss from the Technology Segment to the Graphics Segment [Member] | Second Quarter of Fiscal 2016 [Member] |  |  |  |  |
Prior Period Reclassification Adjustment |  |  | 76,000 |  |
Reclassification of Operating Loss from the Technology Segment to the Graphics Segment [Member] | First Quarter of Fiscal 2016 [Member] |  |  |  |  |
Prior Period Reclassification Adjustment |  |  | $ 3,000 |  |

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