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Note 4 - Balance Sheet Components - Long-term Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Deferred compensation plan liabilities $ 36,594 $ 32,283
Dividend equivalents 5,921 6,145
Operating lease liabilities 893 0
Other 29 97
Total $ 43,437 $ 38,525