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Note 4 - Balance Sheet Components - Other Long-term Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Deferred compensation plan liabilities $ 49,905 $ 55,489
Dividend equivalents 8,352 8,470
Other 2,477 3,268
Total $ 60,734 $ 67,227