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Note 2 - Summary of Significant Accounting Policies (Details Textual) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2017 | Mar. 31, 2018 | Mar. 31, 2017 | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2017
Cash, FDIC Insured Amount | $ 250,000 |  |  | $ 250,000 |  |  |  |
Cash, Uninsured Amount | 4,391,000 |  |  | 4,391,000 |  |  |  | $ 4,488,000
Depreciation, Total | 1,825,000 |  | $ 1,725,000 | 5,569,000 | $ 5,122,000 |  |  |
Fair Value Disclosure, Off-balance Sheet Risks, Amount, Asset | 0 |  |  | $ 0 |  |  |  |
Standard Warranty Extended Term for Exceptions |  |  |  | 10 years |  |  |  |
Research and Development Expense, Total | $ 1,463,000 |  | $ 144,700 | $ 4,404,000 | $ 4,117,000 |  |  |
Incremental Common Shares Attributable to Dilutive Effect of Contingently Issuable Shares | 856,000 |  | 297,000 | 289,000 | 853,000 |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 28.90% |  | 32.00% | 28.90% | 30.40% |  |  |
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability |  | $ 4,676,578 |  |  |  |  |  |
Income Tax Expense (Benefit), Total | $ 123,000 |  | $ (406,000) | $ (3,867,000) | $ 677,000 |  |  |
Accounting Standards Update 2016-09 [Member] |  |  |  |  |  |  |  |
Income Tax Expense (Benefit), Total |  |  |  | $ 92,996 |  |  |  |
Scenario, Forecast [Member] |  |  |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  |  |  |  |  | 21.00% | 27.60% |
Scenario, Forecast [Member] | Transferred at Point in Time [Member] | Lighting Segment [Member] |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax, Percent of Revenue |  |  |  |  |  | 90.00% |  |
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] | Leasehold Improvements [Member] |  |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  |  | 15 years |  |  |  |

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