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Note 12 - Fair Value Measurements - Changes in Fair Value of Level 3 Assets and Liabilities (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Contingent Payments [Member]    
Balance at beginning of reporting period, liability $ (2,407) $ (2,887)
Included in interest income (expense), liability (140) (249)
Included in other comprehensive income (loss), liability 0 0
Included in other items, net, liability (42) (110)
Settlements, liability 877 839
Balance at end of reporting period, liability (1,712) (2,407)
Investment, Available-For-Sale [Member]    
Balance at beginning of reporting period, asset 15,772 17,752
Included in interest income (expense), asset 150 144
Included in other comprehensive income (loss), asset 739 (1,649)
Included in other items, net, asset 0 0
Settlements, asset (510) (475)
Balance at end of reporting period, asset $ 16,151 $ 15,772