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Note 10 - Income Taxes - Components of Net Deferred Tax Assets (Details) - USD ($) | Jun. 30, 2017 | Jun. 30, 2016
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Deferred Tax Assets: |  |
Net operating loss carryforwards | $ 8,126,000 | $ 6,473,000
Stock compensation | 1,646,000 | 1,503,000
Other, net | 155,000 | 131,000
Net deferred tax assets | 9,927,000 | 8,107,000
Valuation allowance for deferred tax assets | (9,927,000) | (8,107,000)
Net deferred tax assets |  |

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