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Note 6 - Stock Option Grant Activity (Details) - $ / shares | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2016 | Jun. 30, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Outstanding January 1, 2016 (in shares) |  | 1,707,744 | 1,217,744 | 977,744
Outstanding January 1, 2016 (in dollars per share) |  | $ 0.84 | $ 0.68 | $ 0.60
Granted (in shares) |  | 1,301,084 | 490,000 | 240,000
Granted (in dollars per share) | $ 1.25 | $ 1.25 | $ 1.25 | $ 1
Outstanding June 30, 2016 (in shares) | 2,592,229 | 2,592,229 | 1,707,744 | 1,217,744
Outstanding June 30, 2016 (in dollars per share) | $ 1.04 | $ 1.04 | $ 0.84 | $ 0.68

X
- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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Period Type: | duration

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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options. + References No definition available. + Details
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