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Note 8 - Equity - Stock Options Activity (Details) - $ / shares | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Granted at Market Price, Number of Shares (in shares) | 660,000 | 240,160 |
Exercised, Number of Shares (in shares) | (70,931) | (534) |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | 660,000 | 240,160 |
Employee Stock Option [Member] |  |  |
Outstanding, Number of Shares (in shares) | 477,459 | 314,775 |
Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 4.30 | $ 2.23 |
Outstanding, Weighted Average Fair Value (in dollars per share) | $ 1.86 | $ 2.01 | $ 0.92
Outstanding, Weighted Average Remaining Contractual Life (Year) | 6 years 328 days | 8 years 255 days | 9 years 73 days
Granted at Market Price, Number of Shares (in shares) | 660,000 | 240,160 |
Granted at Market Price, Weighted Average Exercise Price (in dollars per share) | $ 3.22 | $ 8.16 |
Exercised, Number of Shares (in shares) | (37,824) | (445) |
Exercised, Weighted Average Exercise Price (in dollars per share) | $ 1.88 | $ 1.20 |
Cancelled, Number of Shares (in shares) | (146,560) | (77,031) |
Cancelled, Weighted Average Exercise Price (in dollars per share) | $ 4.34 | $ 7.88 |
Outstanding, Number of Shares (in shares) | 953,075 | 477,459 | 314,775
Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 3.66 | $ 4.30 | $ 2.23
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | 660,000 | 240,160 |
Granted at Market Price, Weighted Average Exercise Price (in dollars per share) | $ 3.22 | $ 8.16 |
Exercised, Weighted Average Exercise Price (in dollars per share) | 1.88 | 1.20 |
Cancelled, Weighted Average Exercise Price (in dollars per share) | $ 4.34 | $ 7.88 |
Exercisable, Number of Shares (in shares) | 347,272 |  |
Exercisable, Weighted Average Exercise Price (in dollars per share) | $ 4.07 |  |
Exercisable, Weighted Average Fair Value (in dollars per share) | $ 2.38 |  |
Exercisable, Weighted Average Remaining Contractual Life (Year) | 3 years 328 days |  |

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- Definition The weighted-average fair value as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + References No definition available. + Details
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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the 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)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable 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)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired. + 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)(3)-(4) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price of options that were either forfeited or expired. + 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)(3)-(4) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + 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=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 remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 + Details
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