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Note 8 - Stockholders' Deficit (Details) - $ / shares | 9 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Jun. 30, 2018 | Jun. 30, 2017
Shares purchasable under outstanding warrants, beginning | 1,740,790 | 2,342,590 | 2,804,010
Stock purchase warrants issued | 0 | 0 |
Stock purchase warrants expired | (1,657,457) | (141,643) | (271,420)
Stock purchase warrants exchanged |  | (460,157) | (190,000)
Shares purchasable under outstanding warrants, ending | 83,333 | 1,740,790 | 2,342,590
Shares purchasable under outstanding warrants, weighted average exercise price, beginning | $ 2.03 | $ 1.97 | $ 2.00
Stock purchase warrants issued, weighted average exercise price | 0.00 | 0.00 |
Stock purchase warrants expired, weighted average exercise price | 2.03 | 0.60 | 1.40
Stock purchase warrants exchanged, weighted average exercise price |  | 2.15 | 3.00
Shares purchasable under outstanding warrants, weighted average exercise price, ending | $ 2.00 | $ 2.03 | $ 1.97
Shares purchasable under outstanding warrants, remaining contractual term (Year) |  | 8 months 27 days |
Warrants outstanding and exercisable, remaining contractual term, beginning | 8 months 27 days |  |
Warrants outstanding and exercisable, remaining contractual term, ending | 6 months |  |
Minimum [Member] |  |  |
Shares purchasable under outstanding warrants, remaining contractual term (Year) |  |  | 1 month 13 days
Maximum [Member] |  |  |
Shares purchasable under outstanding warrants, remaining contractual term (Year) |  |  | 1 year 6 months 18 days

X
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- Definition Number of warrants or rights outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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