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Note 12 - Equity Incentive Plan (Tables) | 12 Months Ended
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Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | December 31,
|  | 2014 |  | 2013 |  | 2012
Risk free interest rate |  | 1.16% | to | 1.39% |  | 0.61% | to | 1.02% |  | 0.63% | to | 0.64%
Expected volatility |  | 53.28% | to | 57.05% |  | 53.60% | to | 57.60% |  |  | 57.60% |
Expected lives (years) |  |  | 4 |  |  |  | 4 |  |  |  | 4 |
Expected dividend yield |  |  | 0.00% |  |  |  | 0.00% |  |  |  | 0.00% |
Schedule of Share-based Compensation, Stock Options and Stock Appreciation Rights Award Activity [Table Text Block] |
|  | 2014 |  |  | 2013 |
|  | Number of Shares |  |  | Weighted Average Exercise Price Per Share |  |  | Number of Shares |  |  | Weighted Average Exercise Price Per Share |
Options and SAR's outstanding at beginning of year |  |  | 1,513,326 |  |  | $ | 9.14 |  |  |  | 1,793,685 |  |  | $ | 8.30 |
Granted |  |  | 179,240 |  |  | $ | 35.62 |  |  |  | 413,500 |  |  | $ | 12.55 |
Cancelled |  |  | (53,325 | ) |  | $ | 23.73 |  |  |  | (243,724 | ) |  | $ | 8.77 |
Expired |  |  | (24,292 | ) |  | $ | 9.87 |  |  |  | (9,928 | ) |  | $ | 9.62 |
Exercised |  |  | (763,662 | ) |  | $ | 7.95 |  |  |  | (440,207 | ) |  | $ | 8.71 |
Options and SAR's outstanding at end of year |  |  | 851,287 |  |  | $ | 14.85 |  |  |  | 1,513,326 |  |  | $ | 9.14 |
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] |
|  | 2014 |  |  | 2013 |
|  | Number of Shares |  |  | Weighted Average Grant Date Fair Value |  |  | Number of Shares |  |  | Weighted Average Grant Date Fair Value |
Nonvested at Beginning of year |  |  | 79,591 |  |  | $ | 11.93 |  |  |  | 68,956 |  |  | $ | 6.87 |
Granted |  |  | 60,098 |  |  | $ | 32.02 |  |  |  | 36,220 |  |  | $ | 17.00 |
Cancelled |  |  | (7,500 | ) |  | $ | 25.46 |  |  |  | - |  |  | $ | - |
Expired |  |  | - |  |  | $ | - |  |  |  | - |  |  | $ | - |
Vested/Released |  |  | (22,575 | ) |  | $ | 10.01 |  |  |  | (25,585 | ) |  | $ | 5.95 |
Nonvested at end of year |  |  | 109,614 |  |  | $ | 23.91 |  |  |  | 79,591 |  |  | $ | 11.93 |

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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock units. + 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)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for stock options and stock appreciation rights that were outstanding at the beginning and end of the year, exercisable at the end of the year, and the number of stock options and stock appreciation rights that were granted, exercised or converted, forfeited, and expired during the year. + 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) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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 (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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