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Note 1 - Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2019
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
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] |
|  | Years Ended December 31,
|  | 2019 |  | 2018 |  | 2017
Share-based compensation expense |  | $ | 1,591 |  |  | $ | 1,212 |  |  | $ | 1,068 |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | Years Ended December 31,
|  | 2019 |  | 2018 |  | 2017
Expected volatility |  |  | 28.9 | % |  |  | 27.7 | % |  | 27.4% | - | 29.1%
Expected dividends |  |  | None |  |  |  | None |  |  |  | None |
Risk-free interest rate |  |  | 2.3 | % |  |  | 2.7 | % |  | 1.56% | - | 1.84%
Exercise price |  | $ | 38.61 |  |  | $ | 31.20 |  |  | $27.05 | - | $28.70
Expected term (in years) |  |  | 6.0 |  |  |  | 6.0 |  |  | 2.7 | to | 5.8
Weighted-average grant date fair value |  | $ | 12.70 |  |  | $ | 10.15 |  |  | $5.59 | - | $8.51

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