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Note 15 - Accumulated Other Comprehensive Loss - Other Comprehensive Loss (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Balance | $ 461,215 | $ 379,833 | $ 327,645
Balance | 541,497 | 461,215 | 379,833
Accumulated Foreign Currency Adjustment Attributable to Parent [Member] |  |  |
Balance | (5,234) | (10,753) | (5,212)
Other comprehensive (loss) income before reclassifications | (3,258) | 5,519 | (5,541)
Amounts reclassified from accumulated other comprehensive income (loss) |  |  |
Net current-period other comprehensive (loss) income | (3,258) | 5,519 | (5,541)
Balance | $ (8,492) | $ (5,234) | $ (10,753)

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