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Note 14 - Income Taxes (Details Textual) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2017 | Mar. 31, 2019 | Jun. 30, 2019
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 34.00% |  |
Forecast [Member] |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  |  | 21.00%
Lighting Reporting Unit [Member] |  |  |
Deferred Tax Assets, Increase During Period, Impairment of Goodwill | $ 10.7 | $ 4.8 |

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