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Note 2 - Summary of Significant Accounting Policies (Details Textual) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Dec. 31, 2016 USD ($) shares | Dec. 31, 2015 USD ($) shares | Dec. 31, 2016 USD ($) shares | Dec. 31, 2015 USD ($) shares | Jun. 30, 2016 USD ($)
Number of Revenue Sources | 5 |  | 5 |  |
Cash, FDIC Insured Amount | $ 250,000 |  | $ 250,000 |  |
Cash, Uninsured Amount | 35,995,000 |  | 35,995,000 |  | $ 37,883,000
Depreciation | 1,669,000 | $ 1,471,000 | 3,397,000 | $ 2,921,000 |
Research and Development Expense | $ 1,269,000 | $ 1,320,000 | $ 2,670,000 | $ 2,631,000 |
Incremental Common Shares Attributable to Dilutive Effect of Contingently Issuable Shares | shares | 787,000 | 987,000 | 852,000 | 836,000 |
Fair Value Disclosure, Off-balance Sheet Risks, Amount, Liability | $ 0 |  | $ 0 |  |
Fair Value Disclosure, Off-balance Sheet Risks, Amount, Asset | 0 |  | 0 |  |
Lighting Segment [Member] |  |  |  |  |
Assets Held-for-sale, Not Part of Disposal Group | 1,713,000 |  | 1,713,000 |  |
Graphics Segment [Member] |  |  |  |  |
Assets Held-for-sale, Not Part of Disposal Group | $ 1,463,000 |  | $ 1,463,000 |  |
Minimum [Member] |  |  |  |  |
Media Content Service Period |  |  | 30 days |  |
Finite-Lived Intangible Asset, Useful Life |  |  | 7 years |  |
Standard Warranty Term |  |  | 1 year |  |
Maximum [Member] |  |  |  |  |
Media Content Service Period |  |  | 1 year |  |
Finite-Lived Intangible Asset, Useful Life |  |  | 20 years |  |
Standard Warranty Term |  |  | 5 years |  |
Maximum [Member] | Product Warranty Exceptions [Member] |  |  |  |  |
Standard Warranty Term |  |  | 10 years |  |
Maximum [Member] | Leasehold Improvements [Member] |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  | 15 years |  |

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