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Note 9 - Stock Options - Common Shares Reserved for Future Issuance (Details) | Dec. 31, 2016 shares
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Common shares reserved for future issuance (in shares) | 3,852,609
The 2015 Stock Incentive Plan [Member] |
Common shares reserved for future issuance (in shares) | 600,000
The 2005 Stock Incentive Plan [Member] |
Common shares reserved for future issuance (in shares) | 2,185,000
Preferred Stock [Member] |
Common shares reserved for future issuance (in shares) | 1,067,000

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- Definition Aggregate number of common shares reserved for future issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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