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Note 2 - Summary of Significant Accounting Policies (Details Textual) | 3 Months Ended | 9 Months Ended | 15 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2017 USD ($) shares | Sep. 30, 2016 USD ($) shares | Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($)
Number of Revenue Sources | 5 |  | 5 |  | 5 |
Cash, Uninsured Amount | $ 5,080,127 |  | $ 5,080,127 |  | $ 5,080,127 | $ 4,615,000
Depreciation | 1,882,000 | $ 1,728,000 |  |  |  |
Fair Value Disclosure, Off-balance Sheet Risks, Amount, Asset | 0 |  | 0 |  | 0 |
Goodwill | 30,538,000 |  | 30,538,000 |  | 30,538,000 | 58,538,000
Goodwill, Impairment Loss | 28,000,000 |  | 28,000,000 |  |  |
Research and Development Expense | $ 1,562,000 |  |  |  | 1,401,000 |
Incremental Common Shares Attributable to Dilutive Effect of Contingently Issuable Shares | shares | 286,000 | 914,000 |  |  |  |
Income Tax Expense (Benefit) | $ (9,588,000) | $ 251,000 |  |  |  |
Accounting Standards Update 2016-09 [Member] |  |  |  |  |  |
Income Tax Expense (Benefit) | (81,010) |  |  |  |  |
Lighting Segment [Member] |  |  |  |  |  |
Goodwill | 29,373,000 |  | $ 29,373,000 |  | $ 29,373,000 | $ 57,373,000
Goodwill, Impairment Loss | $ 28,000,000 |  |  |  |  |
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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