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Note 7 - Stockholders' Equity (Deficit) - Stock Option Grant Activity (Details) - $ / shares | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015
Granted (in shares) | 1,308,300 |
Granted, stock options, weighted average exercise price (in dollars per share) | $ 1.25 |
Converted (in shares) | (25,000) |
Outstanding December 31, 2016 (in shares) | 2,484,445 |
Outstanding, stock options, weighted average exercise price, December 31, 2016 (in dollars per share) | $ 1.18 |
The 2006 Plan [Member] |  |
Outstanding January 1, 2016 (in shares) | 1,707,744 |
Outstanding, stock options, weighted average exercise price, January 1, 2016 (in dollars per share) | $ 0.84 |
Outstanding, stock options, weighted average remaining contractual life, January 1, 2016 (Year) | 9 years 299 days | 6 years 164 days
Granted (in shares) | 1,308,300 |
Granted, stock options, weighted average exercise price (in dollars per share) | $ 1.25 |
Granted, stock options, weighted average remaining contractual life (Year) | 10 years 127 days |
Expired (in shares) | (506,599) |
Expired, stock options, weighted average exercise price (in dollars per share) | $ 0.26 |
Converted (in shares) | (25,000) |
Converted, stock options, weighted average exercise price (in dollars per share) | $ 0.26 |
Outstanding December 31, 2016 (in shares) | 2,484,445 | 1,707,744
Outstanding, stock options, weighted average exercise price, December 31, 2016 (in dollars per share) | $ 1.18 | $ 0.84

X
- Definition Weighted average remaining contractual term for option awards granted during the period, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements. + 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)(iv)(4) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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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=96867065&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=96867065&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=96867065&loc=d3e5070-113901 + Details
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