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Note 11 - Fair Value Measurements (Details Textual) - Warrant [Member] - USD ($) | Jun. 30, 2017 | Jun. 30, 2016
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Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value |  | $ 24,000
Fair Value, Inputs, Level 3 [Member] |  |
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value | $ 0 | $ 24,000

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- Definition Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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