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Note 13 - Share-based Payments (Tables) | 3 Months Ended
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Mar. 31, 2017
Notes Tables |
Share-based Compensation, Stock Options, Activity [Table Text Block] |
|  | Three months ended March 31, 2017 |  |  | Three months ended March 31, 2016 |
|  | Number of shares |  |  | Weighted average exercise price per share |  |  | Number of shares |  |  | Weighted average e xercise price per share |
Outstanding, beginning of period |  |  | 474,501 |  |  | $ | 12.67 |  |  |  | 513,366 |  |  | $ | 9.24 |
Granted |  |  | 32,875 |  |  |  | 40.56 |  |  |  | 55,000 |  |  |  | 20.89 |
Exercised |  |  | (68,876 | ) |  |  | 7.83 |  |  |  | (11,574 | ) |  |  | 4.63 |
Forfeited |  |  | (7,889 | ) |  |  | 18.46 |  |  |  | (5,401 | ) |  |  | 12.24 |
Expired |  |  | - |  |  |  | - |  |  |  | (750 | ) |  |  | 3.76 |
Outstanding, end of period |  |  | 430,611 |  |  |  | 15.46 |  |  |  | 550,641 |  |  |  | 10.48 |
Options exercisable, end of period |  |  | 264,753 |  |  | $ | 10.72 |  |  |  | 311,594 |  |  | $ | 6.54 |
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block] |
|  |  |  | Options outstanding |  |  | Options exercisable |
Exercise price |  | Number outstanding |  |  | Weighted average exercise price per share |  |  | Weighted average remaining contractual life (years) |  |  | Aggregate intrinsic value |  |  | Number exercisable |  |  | Weighted average exercise price per share |  |  | Weighted average remaining contractual life (years) |  |  | Aggregate intrinsic value |
$ 2.80 | - | $ 8.92 |  |  | 173,473 |  |  | $ | 6.11 |  |  |  | 1.9 |  |  | $ | 7,796,487 |  |  |  | 159,554 |  |  | $ | 5.89 |  |  |  | 1.8 |  |  | $ | 7,205,069 |
$10.16 | - | $19.95 |  |  | 140,013 |  |  |  | 16.26 |  |  |  | 4.1 |  |  |  | 4,871,179 |  |  |  | 77,699 |  |  |  | 16.01 |  |  |  | 3.8 |  |  |  | 2,722,299 |
$21.10 | - | $27.53 |  |  | 84,250 |  |  |  | 23.61 |  |  |  | 5.0 |  |  |  | 2,312,190 |  |  |  | 27,500 |  |  |  | 23.73 |  |  |  | 4.2 |  |  |  | 751,250 |
$35.25 | - | $37.35 |  |  | 14,375 |  |  |  | 35.89 |  |  |  | 6.2 |  |  |  | 217,937 |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
$43.15 | - | $47.00 |  |  | 18,500 |  |  |  | 44.19 |  |  |  | 6.8 |  |  |  | 126,900 |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
|  |  |  |  | 430,611 |  |  | $ | 15.46 |  |  |  | 3.6 |  |  | $ | 15,324,693 |  |  |  | 264,753 |  |  | $ | 10.72 |  |  |  | 2.6 |  |  | $ | 10,678,618 |

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- Definition Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms. + 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=96867065&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + 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 (d) -URI http://asc.fasb.org/extlink&oid=96867065&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 (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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