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Note 11 - Income Taxes (Details Textual) - USD ($) | 12 Months Ended
--- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2015
Unrecognized Tax Benefits that Would Impact Effective Tax Rate | $ 925,000 | $ 665,000 |
Unrecognized Tax Benefits, Period Increase (Decrease) | 78,000 | 26,000 | $ 40,000
Unrecognized Tax Benefits, Interest on Income Taxes Expense | 66,000 | 48,000 | 41,000
Unrecognized Tax Benefits, Income Tax Penalties Expense | $ 27,000 | 10,000 | 17,000
Oregon Net Operating Loss, Term | 4 years |  |
Deferred Tax Assets, Capital Loss Carryforwards | $ 3,703,000 | 4,272,000 |
Deferred Tax Assets, Valuation Allowance | 5,556,000 | 6,150,000 |
Unrecognized Tax Benefits | 657,000 | 421,000 |
Unrecognized Tax Benefits, Interest on Income Taxes Accrued | 268,000 | 244,000 |
Unrecognized Tax Benefits, Income Tax Penalties Accrued | 194,000 | 142,000 |
Reserve for Unrecognized Tax Benefits, Including Penalties and Interest | 1,119,000 | 807,000 |
Atlas Lighting Products, Inc. [Member] |  |  |
Unrecognized Tax Benefits, Increase Resulting from Acquisition | 483,000 |  |
Unrecognized Tax Benefits | 314,000 |  |
Unrecognized Tax Benefits, Interest on Income Taxes Accrued | 79,000 |  |
Unrecognized Tax Benefits, Income Tax Penalties Accrued | 90,000 |  |
Domestic Tax Authority [Member] |  |  |
Deferred Tax Assets, Capital Loss Carryforwards | 406,000 | 456,000 |
State and Local Jurisdiction [Member] | New York State Division of Taxation and Finance [Member] |  |  |
Deferred State and Local Income Tax Expense (Benefit) | 0 |  |
Deferred Tax Assets, Operating Loss Carryforwards, State and Local | 1,716,000 | 1,716,000 |
Deferred Tax Assets, Valuation Allowance | 1,716,000 | 1,716,000 |
State and Local Jurisdiction [Member] | Oregon State Tax [Member] |  |  |
Deferred Tax Assets, Research and Development Credit, Expired During Period | 25,000 | 11,000 |
Deferred Tax Assets, Operating Loss Carryforwards, State and Local | $ 137,000 | $ 162,000 |
Foreign Tax Authority [Member] | Canada Revenue Agency [Member] |  |  |
Deferred Tax Assets, Operating Loss Carryforwards, Foreign |  |  | $ 4,272,000

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