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Note 9 - Available-for-sale Securities Measured at Fair Value Using Significant Unobservable Inputs (Details) - Fair Value, Inputs, Level 3 [Member]
$ in Thousands
6 Months Ended
Jun. 30, 2016
USD ($)
Balance, January 1, 2016 $ 2,653
Payments received (197)
Included in other comprehensive income (loss) (56)
Balance, June 30, 2016 $ 2,400