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Note 8 - Stock Option Plan | 9 Months Ended
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Sep. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Disclosure of Compensation Related Costs, Share-based Payments [Text Block] | 8. Stock option plan: The following table presents stock option activity for the period:
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
|  | 2013 |  |  | 2014 |  |  | 2013 |  |  | 2014 |
Outstanding, beginning of period |  |  | 1,304,441 |  |  |  | 1,442,741 |  |  |  | 1,128,437 |  |  |  | 1,333,099 |
Granted |  |  | 42,592 |  |  |  | 6,273 |  |  |  | 292,417 |  |  |  | 163,504 |
Exercised |  |  | (3,086 | ) |  |  | (1,028 | ) |  |  | (4,115 | ) |  |  | (1,800 | )
Forfeited and expired |  |  | (876 | ) |  |  | (4,411 | ) |  |  | (73,668 | ) |  |  | (51,228 | )
Outstanding, end of period |  |  | 1,343,071 |  |  |  | 1,443,575 |  |  |  | 1,343,071 |  |  |  | 1,443,575 |
Exercisable, end of period |  |  | 898,894 |  |  |  | 1,078,009 |  |  |  | 898,894 |  |  |  | 1,078,009 |
The fair value of each option issued to employees and non-employees is estimated using the Black-Scholes option-pricing model with the following weighted-average assumptions:
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
|  | 2013 |  |  | 2014 |  |  | 2013 |  |  | 2014 |
Average risk-free interest rate |  |  | 1.82 | % |  |  | 1.95 | % |  |  | 1.03 | % |  |  | 1.97 | %
Average expected term (in years) |  |  | 6.00 |  |  |  | 6.25 |  |  |  | 6.20 |  |  |  | 6.20 |
Expected volatility |  |  | 70 | % |  |  | 74 | % |  |  | 70 | % |  |  | 74 | %
Expected dividend yield |  |  | 0.00 | % |  |  | 0.00 | % |  |  | 0.00 | % |  |  | 0.00 | %
Estimated forfeiture rate |  |  | 0.00 | % |  |  | 0.00 | % |  |  | 0.00 | % |  |  | 0.00 | %

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- Definition The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: 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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6406099&loc=d3e25284-112666 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5444-113901 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 + Details
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