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Note 16 - Accumulated Other Comprehensive Income - Components of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Beginning balance |  |  | $ 5,522,147 | $ 5,402,874
Net current-period other comprehensive income | $ 138 | $ (412) | 416 | 307
Ending balance | 5,488,978 | 5,425,602 | 5,488,978 | 5,425,602
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member] |  |  |  |
Beginning balance |  |  | (344) | (975)
Other comprehensive income before reclassifications |  |  | 416 | 205
Amounts reclassified from AOCI |  |  |  |
Net current-period other comprehensive income |  |  | 416 | 205
Ending balance | 72 | (770) | 72 | (770)
Accumulated Foreign Currency Adjustment Attributable to Parent [Member] |  |  |  |
Beginning balance |  |  |  | 6,335
Other comprehensive income before reclassifications |  |  |  | 1,721
Amounts reclassified from AOCI |  |  |  |
Net current-period other comprehensive income |  |  |  | 1,721
Ending balance |  | 8,056 |  | 8,056
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] |  |  |  |
Beginning balance |  |  |  | 406
Other comprehensive income before reclassifications |  |  |  | (1,619)
Amounts reclassified from AOCI |  |  |  |
Net current-period other comprehensive income |  |  |  | (1,619)
Ending balance |  | (1,213) |  | (1,213)
AOCI Attributable to Parent [Member] |  |  |  |
Beginning balance |  |  | (1,480) | 5,766
Other comprehensive income before reclassifications |  |  |  | 307
Amounts reclassified from AOCI |  |  |  |
Net current-period other comprehensive income |  |  |  | 307
Ending balance | $ 72 | $ 6,073 | $ 72 | $ 6,073

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