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Note 6 - Analysis of Non-vested Stock Options (Details) - $ / shares | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Non-Vested Stock Options 1 [Member] |  |  |
Number of Options (in shares) | 104,450 |  |
Remaining Contractual Life | 62 days |  |
Exercise Price (in dollars per share) | $ 0.26 |  |
Non-Vested Stock Options 2 [Member] |  |  |
Number of Options (in shares) | 312,449 |  |
Remaining Contractual Life | 76 days |  |
Exercise Price (in dollars per share) | $ 0.26 |  |
Non-Vested Stock Options 3 [Member] |  |  |
Number of Options (in shares) | 55,000 |  |
Remaining Contractual Life | 215 days |  |
Exercise Price (in dollars per share) | $ 0.26 |  |
Non-Vested Stock Options 4 [Member] |  |  |
Number of Options (in shares) | 60,000 |  |
Remaining Contractual Life | 306 days |  |
Exercise Price (in dollars per share) | $ 0.26 |  |
Non-Vested Stock Options 5 [Member] |  |  |
Number of Options (in shares) | 21,146 |  |
Remaining Contractual Life | 1 year 32 days |  |
Exercise Price (in dollars per share) | $ 1 |  |
Non-Vested Stock Options 6 [Member] |  |  |
Number of Options (in shares) | 290,000 |  |
Remaining Contractual Life | 5 years 91 days |  |
Exercise Price (in dollars per share) | $ 1 |  |
Non-Vested Stock Options 7 [Member] |  |  |
Number of Options (in shares) | 10,000 |  |
Remaining Contractual Life | 5 years 164 days |  |
Exercise Price (in dollars per share) | $ 1 |  |
Non-Vested Stock Options 8 [Member] |  |  |
Number of Options (in shares) | 50,000 |  |
Remaining Contractual Life | 6 years 91 days |  |
Exercise Price (in dollars per share) | $ 1 |  |
Non-Vested Stock Options 9 [Member] |  |  |
Number of Options (in shares) | 75,000 |  |
Remaining Contractual Life | 6 years 335 days |  |
Exercise Price (in dollars per share) | $ 1 |  |
Non-Vested Stock Options 10 [Member] |  |  |
Number of Options (in shares) | 90,000 |  |
Remaining Contractual Life | 8 years 62 days |  |
Exercise Price (in dollars per share) | $ 1 |  |
Non-Vested Stock Options 11 [Member] |  |  |
Number of Options (in shares) | 215,000 |  |
Remaining Contractual Life | 9 years 62 days |  |
Exercise Price (in dollars per share) | $ 1.25 |  |
Non-Vested Stock Options 12 [Member] |  |  |
Number of Options (in shares) | 75,000 |  |
Remaining Contractual Life | 9 years 69 days |  |
Exercise Price (in dollars per share) | $ 1.25 |  |
Non-Vested Stock Options 13 [Member] |  |  |
Number of Options (in shares) | 150,000 |  |
Remaining Contractual Life | 11 years 62 days |  |
Exercise Price (in dollars per share) | $ 1 |  |
Non-Vested Stock Options 14 [Member] |  |  |
Number of Options (in shares) | 200,000 |  |
Remaining Contractual Life | 14 years 25 days |  |
Exercise Price (in dollars per share) | $ 1.25 |  |
Number of Options (in shares) | 1,707,744 |  |
Exercise Price (in dollars per share) | $ 0.84 | $ 0.68 | $ 0.60

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- Definition Remaining contractual life of a nonvested option, 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 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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