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Note 8 - Fair Value Measurements - Changes in Fair Value of Level 3 Assets and Liabilities (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Contingent Payments [Member]        
Balance at beginning of reporting period, liability $ 0 $ (769) $ (62) $ (924)
Included in interest income (expense), liability 0 (8) 0 (21)
Included in other comprehensive income (loss), liability 0 0 0 0
Included in other items, net, liability 0 (23) 0 3
Settlements, liability 0 311 62 453
Balance at end of reporting period, liability 0 (489) 0 (489)
Investment, Available-For-Sale [Member]        
Balance at beginning of reporting period, asset 15,612 16,297 15,822 16,692
Included in interest income (expense), asset 42 41 84 82
Included in other comprehensive income (loss), asset (903) (52) (1,155) (488)
Included in other items, net, asset 0 0 0 0
Settlements, asset (635) (590) (635) (590)
Balance at end of reporting period, asset $ 14,116 $ 15,696 $ 14,116 $ 15,696