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Note 8 - Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2018
Notes Tables |
Share-based Compensation, Stock Options, Activity [Table Text Block] |
|  | Number of options and SAR units (1) |  |  | Weighted average exercise price |  |  | Weighted average remaining contractual term |  |  | Aggregate intrinsic-value |
Outstanding at the beginning of the year |  |  | 729,017 |  |  | $ | 19.77 |  |  |  | 5.2 |  |  | $ | 19,229 |
Granted |  |  | — |  |  |  | — |  |  |  |  |  |  |  |  |
Exercised |  |  | (22,530 | ) |  |  | 16.07 |  |  |  |  |  |  |  |  |
Forfeited or expired |  |  | (3,670 | ) |  |  | 22.67 |  |  |  |  |  |  |  |  |
Outstanding at the end of the year (2) |  |  | 702,817 |  |  | $ | 19.88 |  |  |  | 4.3 |  |  | $ | 2,708 |
Exercisable at the end of the year (3) |  |  | 623,718 |  |  | $ | 19.14 |  |  |  | 4.0 |  |  | $ | 2,648 |
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block] |
|  |  |  |  | Outstanding |  |  | Exercisable |
Exercise price (range) |  |  | Number of options and SAR s |  |  | Weighted average remaining contractual life (years) |  |  | Weighted average exercise price |  |  | Number of options and SARs |  |  | Weighted average remaining contractual life (years) |  |  | Weighted average exercise price |
14.16 | - | 18.62 |  |  |  | 346,863 |  |  |  | 3.2 |  |  | $ | 15.68 |  |  |  | 344,527 |  |  |  | 3.2 |  |  | $ | 15.66 |
19.36 | - | 19.83 |  |  |  | 182,995 |  |  |  | 5.0 |  |  | $ | 19.44 |  |  |  | 163,050 |  |  |  | 4.9 |  |  | $ | 19.43 |
24.86 | - | 30.60 |  |  |  | 172,959 |  |  |  | 5.7 |  |  | $ | 28.75 |  |  |  | 116,141 |  |  |  | 4.9 |  |  | $ | 29.06 |
|  |  |  |  |  | 702,817 |  |  |  | 4.3 |  |  | $ | 19.88 |  |  |  | 623,718 |  |  |  | 4.0 |  |  | $ | 19.14 |
Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block] |
|  | Number of RSUs |  |  | Weighted average Grant-Date fair value |
Unvested as at the beginning of the year |  |  | 560,616 |  |  | $ | 29.31 |
Granted |  |  | 328,896 |  |  |  | 34.14 |
Vested |  |  | (280,890 | ) |  |  | 28.09 |
Forfeited |  |  | (44,232 | ) |  |  | 35.12 |
Unvested at the end of the year |  |  | 564,390 |  |  | $ | 32.28 |

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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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