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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] - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Balance, January 1, $ 116 $ 215
Payments received 0 (118)
Included in earnings 0 0
Included in other comprehensive (loss) income (4) 18
Transfers in and/or out of Level 3 0 0
Balance, March 31, $ 112 $ 115