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Note 1 - Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2018
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 Goodwill [Table Text Block] |
|  | Goodwill |
December 31, 2017 |  | $ | 7,322 |  |
Acquired in Dielectrics business combination (See Note 22) |  |  | 44,516 |  |
December 31, 2018 |  | $ | 51,838 |  |
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block] |
|  | Years Ended December 31,
|  | 2018 |  | 2017 |  | 2016
Share-based compensation expense |  | $ | 1,212 |  |  | $ | 1,068 |  |  | $ | 1,056 |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | Years Ended December 31,
|  | 2018 |  | 2017 |  | 2016
Expected volatility |  |  | 27.7 | % |  |  | 27.4% | - | 29.1% |  |  |  | 29.7 | %
Expected dividends |  |  | None |  |  |  |  | None |  |  |  |  | None |
Risk-free interest rate |  |  | 2.7 | % |  |  | 1.56% | - | 1.84% |  |  |  | 0.9 | %
Exercise price |  | $ | 31.20 |  |  |  | $27.05 | – | $28.70 |  |  | $ | 22.02 |
Expected term (in years) |  |  | 6.0 |  |  |  | 2.7 | to | 5.8 |  |  |  | 5.0 |
Weighted-average grant-date fair value |  | $ | 10.15 |  |  |  | 5.59 | - | $8.51 |  |  | $ | 6.11 |

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