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Note 11 - Income Taxes - Deferred Tax Asset (Details) - USD ($) | Jun. 30, 2018 | Jun. 30, 2017
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Deferred tax asset: |  |
Investment in the Joint Venture Company | $ 5,851,376 | $ 8,747,508
State deferred tax assets | 3,122,042 | 2,118,225
Stock option expenses | 523,249 | 125,855
Net operating losses | 2,454,203 | 3,260,495
Valuation allowance | (11,950,870) | (14,252,083)
Net deferred tax assets |  |

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- Definition Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b),(c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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