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Note 1 - Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2017
Notes Tables |
Property, Plant and Equipment, Estimated Useful Lives [Table Text Block] |
Leasehold improvements | Shorter of estimated useful life or remaining lease term
Buildings and improvements (in years) | 20 | - | 40
Machinery & Equipment (in years) | 7 | - | 15
Furniture, fixtures, computers & software (in years) | 3 | - | 7
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block] |
|  | Years Ended December 31,
|  | 2017 |  | 2016 |  | 2015
Share-based compensation expense |  | $ | 1,068 |  |  | $ | 1,056 |  |  | $ | 1,069 |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | Years Ended December 31,
|  | 2017 |  | 2016 |  | 2015
Expected volatility |  | 27.4% | - | 29.1% |  |  | 29.7 | % |  | 31.5% | - | 32.3%
Expected dividends |  |  | None |  |  |  | None |  |  |  | None |
Risk-free interest rate |  | 1.56% | - | 1.84% |  |  | 0.9 | % |  | 1.0% | - | 1.2%
Exercise price |  | $27.05 | – | $28.70 |  | $ | 22.02 |  |  | $19.97 | - | $22.36
Expected term (in years) |  | 2.7 | to | 5.8 |  |  | 5.0 |  |  |  | 5.0 |
Weighted-average grant-date fair value |  | $5.59 | - | $8.51 |  | $ | 6.11 |  |  |  | $6.04 |

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