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Note 10 - Shareholders' Equity - Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
Jan. 03, 2011 | Mar. 07, 2008 | Dec. 31, 2015 | Dec. 31, 2014
Note 10 - Shareholders Equity - Stock Option Activity Details |  |  |  |
Shares under option - beginning |  |  | 2,056,122 | 2,131,622
Options granted |  |  | 411,250 | 252,500
Options exercised |  |  | (137,937) | (3,067)
Options forfeited or expired |  |  | (71,466) | (324,933)
Shares under option - ending |  |  | 2,257,969 | 2,056,122
Shares under option - exercisable - ending |  |  | 1,255,736 | 1,296,619
Shares under option vested and expected to vest - ending |  |  | 2,093,294 | 1,957,633
Weighted average exercise price per share of options outstanding - beginning |  |  | $ 6.66 | $ 6.99
Weighted average exercise price per share of options granted | 50,000 | 50,000 | 4.68 | 3.94
Weighted average exercise price per share of options exercised |  |  | $ 3.9 | $ 3.67
Weighted average exercise price per share of options forfeited or expired |  |  | 11.86 | 6.77
Weighted average exercise price per share of options outstanding - ending |  |  | 6.30 | 6.66
Weighted average exercise price per share of options exercisable - ending |  |  | 5.22 | 5.63
Weighted average exercise price per share of options vested and expected to vest - ending |  |  | $ 6.45 | $ 5.33
Weighted average remaining contractual term of options outstanding - ending |  |  | 3 years 208 days | 3 years 292 days
Weighted average remaining contractual term of options exercisable - ending |  |  | 2 years 161 days | 3 years 256 days
Weighted average remaining contractual term of options vested and expected to vest - ending |  |  | 3 years 142 days | 3 years 7 days
Shares under option - ending - aggregate intrinsic value |  |  | $ 3,094 | $ 0
Shares exercisable - ending - aggregate intrinsic value |  |  | 1,786 | 0
Shares vested and expected to vest - aggregate intrinsic value |  |  | $ 2,731 | $ 0

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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 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 Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + 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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- 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 Amount by which the current fair value of the underlying stock exceeds the exercise price of fully vested and expected to vest options outstanding. + 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 (e) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition As of the balance sheet date, the number of shares into which fully vested and expected to vest stock options outstanding can be 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition As of the balance sheet date, the weighted-average exercise price for outstanding stock options that are fully vested or expected to vest. + 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable. + 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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