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Note 15 - Stock-based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2017
Notes Tables |
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block] |
|  | Year Ended December 31, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
|  | (Dollars in thousands, except per share data) |
Cost of revenues |  | $ | 3,369 |  |  | $ | 2,400 |  |  | $ | 1,753 |
Selling and marketing expenses |  |  | 452 |  |  |  | 247 |  |  |  | 123 |
General and administrative expenses |  |  | 4,939 |  |  |  | 2,510 |  |  |  | 2,079 |
Total stock-based compensation expense |  |  | 8,760 |  |  |  | 5,157 |  |  |  | 3,955 |
Tax effect on stock-based compensation expense |  |  | 604 |  |  |  | 617 |  |  |  | 440 |
Net effect of stock-based compensation expense |  | $ | 8,156 |  |  | $ | 4,540 |  |  | $ | 3,515 |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | Year Ended December 31, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
For stock options issued by the Company: |  |  |  |  |  |  |  |  |  |  |  |
Risk-free interest rates |  |  | 1.9 | % |  |  | 1.3 | % |  |  | 1.4 | %
Expected lives (in weighted average years) |  |  | 3.1 |  |  |  | 4.5 |  |  |  | 4.0 |
Dividend yield |  |  | 0.62 | % |  |  | 1.10 | % |  |  | 0.70 | %
Expected volatility (weighted average) |  |  | 27.2 | % |  |  | 30.7 | % |  |  | 29.2 | %
Forfeiture rate (weighted average) |  |  | 0.0 | % |  |  | 8.4 | % |  |  | 0.0 | %
Schedule of Share-based Compensation, Stock Options and Stock Appreciation Rights Award Activity [Table Text Block] |
|  | Year Ended December 31, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
|  | Shares (In thousands) |  |  | Weighted Average Exercise Price |  |  | Shares (In thousands) |  |  | Weighted Average Exercise Price |  |  | Shares (In thousands) |  |  | Weighted Average Exercise Price |
Outstanding at beginning of year |  |  | 2,565 |  |  | $ | 33.36 |  |  |  | 2,438 |  |  | $ | 25.38 |  |  |  | 4,477 |  |  | $ | 27.48 |
Granted, at fair value: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Options |  |  | 30 |  |  |  | 57.97 |  |  |  | 1,155 |  |  |  | 43.01 |  |  |  | 45 |  |  |  | 38.24 |
SARs* |  |  | 132 |  |  |  | 62.55 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
RSUs** |  |  | 23 |  |  |  | — |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercised |  |  | (1,181 | ) |  |  | 25.92 |  |  |  | (967 | ) |  |  | 25.33 |  |  |  | (1,589 | ) |  |  | 26.77 |
Forfeited |  |  | (21 | ) |  |  | 46.15 |  |  |  | (57 | ) |  |  | 24.12 |  |  |  | (125 | ) |  |  | 27.33 |
Expired |  |  | — |  |  |  | — |  |  |  | (4 | ) |  |  | 26.84 |  |  |  | (370 | ) |  |  | 45.78 |
Outstanding at end of year |  |  | 1,548 |  |  |  | 41.35 |  |  |  | 2,565 |  |  |  | 33.36 |  |  |  | 2,438 |  |  |  | 25.38 |
Options and SARs exercisable at end of year |  |  | 431 |  |  |  | 32.61 |  |  |  | 557 |  |  |  | 25.22 |  |  |  | 858 |  |  |  | 26.75 |
Weighted-average fair value of options and SARs granted during the year |  |  |  |  |  | $ | 22.82 |  |  |  |  |  |  | $ | 11.61 |  |  |  |  |  |  | $ | 8.68 |
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 of Stock-based Awards Outstanding |  |  | Weighted Average Remaining Contractual Life in Years |  |  | Aggregate Intrinsic Value |  |  | Number of Stock-based Awards Exercisable |  |  | Weighted Average Remaining Contractual Life in Years |  |  | Aggregate Intrinsic Value |
$ | - |  |  |  | 23 |  |  |  | 3.9 |  |  |  | 1,455 |  |  |  | - |  |  |  | - |  |  |  | - |
| 20.13 |  |  |  | 35 |  |  |  | 1.3 |  |  |  | 1,533 |  |  |  | 35 |  |  |  | 1.3 |  |  |  | 1,533 |
| 23.34 |  |  |  | 176 |  |  |  | 1.4 |  |  |  | 7,150 |  |  |  | 176 |  |  |  | 1.4 |  |  |  | 7,150 |
| 25.65 |  |  |  | 10 |  |  |  | 0.3 |  |  |  | 398 |  |  |  | 10 |  |  |  | 0.3 |  |  |  | 398 |
| 35.15 |  |  |  | 15 |  |  |  | 5.1 |  |  |  | 432 |  |  |  | 15 |  |  |  | 5.1 |  |  |  | 432 |
| 38.24 |  |  |  | 15 |  |  |  | 4.8 |  |  |  | 386 |  |  |  | 15 |  |  |  | 4.8 |  |  |  | 386 |
| 42.87 |  |  |  | 1,074 |  |  |  | 4.5 |  |  |  | 22,651 |  |  |  | 143 |  |  |  | 4.5 |  |  |  | 3,005 |
| 47.46 |  |  |  | 38 |  |  |  | 5.9 |  |  |  | 619 |  |  |  | 38 |  |  |  | 5.9 |  |  |  | 619 |
| 57.97 |  |  |  | 30 |  |  |  | 6.6 |  |  |  | 180 |  |  |  | - |  |  |  | - |  |  |  | - |
| 58.79 |  |  |  | 23 |  |  |  | 4.5 |  |  |  | 120 |  |  |  | - |  |  |  | - |  |  |  | - |
| 63.35 |  |  |  | 109 |  |  |  | 5.9 |  |  |  | 66 |  |  |  | - |  |  |  | - |  |  |  | - |
|  |  |  |  | 1,548 |  |  |  | 4.2 |  |  | $ | 34,990 |  |  |  | 432 |  |  |  | 3.0 |  |  | $ | 13,523 |
|  |  |  | Options Outstanding |  |  | Options Exercisable |
Exercise Price |  |  | Number of Stock-based Awards Outstanding |  |  | Weighted Average Remaining Contractual Life in Years |  |  | Aggregate Intrinsic Value |  |  | Number of Stock-based Awards Exercisable |  |  | Weighted Average Remaining Contractual Life in Years |  |  | Aggregate Intrinsic Value |
$ | 18.56 |  |  |  | 15 |  |  |  | 2.8 |  |  |  | 526 |  |  |  | 15 |  |  |  | 2.8 |  |  |  | 526 |
| 19.69 |  |  |  | 15 |  |  |  | 2.6 |  |  |  | 509 |  |  |  | 15 |  |  |  | 2.6 |  |  |  | 509 |
| 20.13 |  |  |  | 108 |  |  |  | 2.3 |  |  |  | 3,608 |  |  |  | 108 |  |  |  | 2.3 |  |  |  | 3,608 |
| 20.54 |  |  |  | 53 |  |  |  | 2.3 |  |  |  | 1,761 |  |  |  | 28 |  |  |  | 2.3 |  |  |  | 934 |
| 23.34 |  |  |  | 635 |  |  |  | 2.4 |  |  |  | 19,226 |  |  |  | 140 |  |  |  | 2.4 |  |  |  | 4,247 |
| 24.57 |  |  |  | 9 |  |  |  | 2.1 |  |  |  | 269 |  |  |  | 1 |  |  |  | 2.1 |  |  |  | 33 |
| 25.65 |  |  |  | 68 |  |  |  | 1.3 |  |  |  | 1,905 |  |  |  | 68 |  |  |  | 1.3 |  |  |  | 1,905 |
| 26.70 |  |  |  | 15 |  |  |  | 3.8 |  |  |  | 404 |  |  |  | 15 |  |  |  | 3.8 |  |  |  | 404 |
| 28.23 |  |  |  | 30 |  |  |  | 4.8 |  |  |  | 762 |  |  |  | 30 |  |  |  | 4.8 |  |  |  | 762 |
| 29.52 |  |  |  | 400 |  |  |  | 3.6 |  |  |  | 9,640 |  |  |  | 75 |  |  |  | 3.6 |  |  |  | 1,807 |
| 29.95 |  |  |  | 17 |  |  |  | 0.3 |  |  |  | 400 |  |  |  | 17 |  |  |  | 0.3 |  |  |  | 400 |
| 35.15 |  |  |  | 15 |  |  |  | 6.1 |  |  |  | 277 |  |  |  | - |  |  |  | - |  |  |  | - |
| 38.24 |  |  |  | 45 |  |  |  | 5.8 |  |  |  | 692 |  |  |  | 45 |  |  |  | 5.8 |  |  |  | 692 |
| 42.87 |  |  |  | 1,080 |  |  |  | 5.5 |  |  |  | 11,610 |  |  |  | - |  |  |  | - |  |  |  | - |
| 47.46 |  |  |  | 60 |  |  |  | 6.9 |  |  |  | 370 |  |  |  | - |  |  |  | - |  |  |  | - |
|  |  |  |  | 2,565 |  |  |  | 4.1 |  |  | $ | 51,959 |  |  |  | 557 |  |  |  | 2.7 |  |  | $ | 15,827 |
Chief Financial Officer [Member] |
Notes Tables |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
Risk-free interest rates |  |  | 0.81 | %
Expected life (in years) |  |  | 3.375 |
Dividend yield |  |  | 0.80 | %
Expected volatility |  |  | 33.50 | %
Forfeiture rate |  |  | 0.00 | %
|  | Grant of options to purchase 100,000 shares of common stock |  |  | Grant of options to purchase 300,000 shares of common stock |
Risk-free interest rates |  |  | 2.36 | % |  |  | 1.64 | %
Expected life (in years) |  |  | 7.25 |  |  |  | 4.75 |
Dividend yield |  |  | 0.90 | % |  |  | 0.90 | %
Expected volatility |  |  | 42.80 | % |  |  | 33.10 | %
Risk-free interest rates |  |  | 1.30 | %
Expected life (in years) |  |  | 4.0 |
Dividend yield |  |  | 0.70 | %
Expected volatility |  |  | 32.40 | %
Forfeiture rate |  |  | 0.00 | %
Risk-free interest rates |  |  | 1.35 | %
Expected life (in years) |  |  | 4.0 |
Dividend yield |  |  | 0.70 | %
Expected volatility |  |  | 29.20 | %
Forfeiture rate |  |  | 0.00 | %
Stock Appreciation Rights (SARs) [Member] |
Notes Tables |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
Risk-free interest rate |  |  | 1.29 | %
Expected life (in years) |  |  | 6 |
Dividend yield |  |  | 1.14 | %
Expected volatility |  |  | 30.7 | %
Forfeiture rate: |  |  |  |
Senior management |  |  | 0.0 | %
Other employees |  |  | 10.5 | %
Sub-Optimal Exercise Factor: |  |  |  |
Senior management |  |  | 2.5 |
Other employees |  |  | 2.0 |
Risk-free interest rate |  |  | 1.65 | %
Expected life (in years) |  |  | 7 |
Dividend yield |  |  | 1.1 | %
Expected volatility |  |  | 30.6 | %
Forfeiture rate |  |  | 0.0 | %
Sub-Optimal Exercise Factor |  |  | 2.5 |
Risk-free interest rate |  |  | 1.74 | %
Expected life (in years) |  |  | 5 |
Dividend yield |  |  | 0.66 | %
Expected volatility |  |  | 26.3 | %
Forfeiture rate |  |  | 10.3 | %
Sub-Optimal Exercise Factor |  |  | 2 |
Risk-free interest rate |  |  | 2.08 | %
Expected life (in years) |  |  | 7 |
Dividend yield |  |  | 0.69 | %
Expected volatility |  |  | 29.4 | %
Forfeiture rate |  |  | 0.0 | %
Sub-Optimal Exercise Factor |  |  | 2.5 |
Risk-free interest rate |  |  | 2.1 | %
Expected life (in years) |  |  | 6 |
Dividend yield |  |  | 0.6 | %
Expected volatility |  |  | 26.9 | %
Forfeiture rate |  |  | 0.0 | %
Sub-Optimal Exercise Factor |  |  | 2.5 |

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