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Note 15 - Share-based Payments (Details) - Summary of Exercise Prices, Weighted Average Remaining Contractual Life and Intrinsic Values of Outstanding Options - USD ($) | 9 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2015 | Jun. 30, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Dec. 31, 2013
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |  |  |
Number outstanding (in Shares) | 804,495 | 827,076 | 976,062 | 1,007,271 | 1,052,308 | 1,407,639
Weighted average exercise price per share, options outstanding | $ 7.30 | $ 6.69 | $ 6.23 | $ 5.34 | $ 4.01 | $ 3.80
Weighted average remaining contractual life (years), options outstanding | 3 years 109 days |  |  |  |  |
Aggregate intrinsic value, options outstanding (in Dollars) | $ 12,786,303 |  |  |  |  |
Number exercisable (in Shares) | 580,721 |  |  | 732,683 |  |
Weighted average exercise price per share, options exercisable | $ 4.85 |  |  | $ 3.84 |  |
Aggregate intrinsic value, options exercisable (in Dollars) | $ 10,619,484 |  |  |  |  |
Exercise Price Range 01 [Member] |  |  |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |  |  |
Exercise price - lower | $ 2.80 |  |  |  |  |
Exercise price - higher | $ 2.92 |  |  |  |  |
Number outstanding (in Shares) | 326,190 |  |  |  |  |
Weighted average exercise price per share, options outstanding | $ 2.83 |  |  |  |  |
Weighted average remaining contractual life (years), options outstanding | 2 years |  |  |  |  |
Aggregate intrinsic value, options outstanding (in Dollars) | $ 6,624,395 |  |  |  |  |
Number exercisable (in Shares) | 326,190 |  |  |  |  |
Weighted average exercise price per share, options exercisable | $ 2.83 |  |  |  |  |
Aggregate intrinsic value, options exercisable (in Dollars) | $ 6,624,395 |  |  |  |  |
Exercise Price Range 02 [Member] |  |  |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |  |  |
Exercise price - lower | $ 3.00 |  |  |  |  |
Exercise price - higher | $ 5.76 |  |  |  |  |
Number outstanding (in Shares) | 208,940 |  |  |  |  |
Weighted average exercise price per share, options outstanding | $ 5.08 |  |  |  |  |
Weighted average remaining contractual life (years), options outstanding | 2 years 328 days |  |  |  |  |
Aggregate intrinsic value, options outstanding (in Dollars) | $ 3,773,918 |  |  |  |  |
Number exercisable (in Shares) | 161,997 |  |  |  |  |
Weighted average exercise price per share, options exercisable | $ 4.94 |  |  |  |  |
Aggregate intrinsic value, options exercisable (in Dollars) | $ 2,947,569 |  |  |  |  |
Exercise Price Range 03 [Member] |  |  |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |  |  |
Exercise price - lower | $ 8.56 |  |  |  |  |
Exercise price - higher | $ 10.16 |  |  |  |  |
Number outstanding (in Shares) | 110,815 |  |  |  |  |
Weighted average exercise price per share, options outstanding | $ 9.15 |  |  |  |  |
Weighted average remaining contractual life (years), options outstanding | 4 years 219 days |  |  |  |  |
Aggregate intrinsic value, options outstanding (in Dollars) | $ 1,550,282 |  |  |  |  |
Number exercisable (in Shares) | 52,559 |  |  |  |  |
Weighted average exercise price per share, options exercisable | $ 8.95 |  |  |  |  |
Aggregate intrinsic value, options exercisable (in Dollars) | $ 745,913 |  |  |  |  |
Exercise Price Range 04 [Member] |  |  |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |  |  |
Exercise price - lower | $ 14.67 |  |  |  |  |
Exercise price - higher | $ 24.96 |  |  |  |  |
Number outstanding (in Shares) | 158,550 |  |  |  |  |
Weighted average exercise price per share, options outstanding | $ 18.11 |  |  |  |  |
Weighted average remaining contractual life (years), options outstanding | 5 years 219 days |  |  |  |  |
Aggregate intrinsic value, options outstanding (in Dollars) | $ 837,708 |  |  |  |  |
Number exercisable (in Shares) | 39,975 |  |  |  |  |
Weighted average exercise price per share, options exercisable | $ 15.60 |  |  |  |  |
Aggregate intrinsic value, options exercisable (in Dollars) | $ 301,607 |  |  |  |  |

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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 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 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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- Definition The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + 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 (g) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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