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Note 13 - Reclassifications From Accumulated Other Comprehensive Income - Changes in Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Balance     $ 389,078 $ 351,596
Amounts reclassified from accumulated other comprehensive income $ 0 $ 0 0 0
Net current-period other comprehensive income     219 (15)
Balance 398,483 388,493 398,483 388,493
Accounting Standards Update 2016-01 [Member] | Previously Reported [Member]        
Balance     389,078  
AOCI Attributable to Parent [Member]        
Balance 182   (20) 8,433
Other comprehensive income before reclassifications 17 43 219 (15)
Amounts reclassified from accumulated other comprehensive income
Net current-period other comprehensive income 17 43 219 (15)
Balance $ 199 145 $ 199 145
AOCI Attributable to Parent [Member] | Accounting Standards Update 2016-01 [Member] | Previously Reported [Member]        
Balance   $ 102   $ 160