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Note 3 - Revenue Recognition - Assets and Liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Contract with customer liability, balance $ 3,394 $ 2,434
Trade Receivables [Member]    
Contract with customer asset, balance 13,802 14,765
Accrued Revenues [Member] | Licensing and Other [Member]    
Contract with customer asset, balance 1,332 5,479
Accrued Revenues [Member] | Royalty [Member]    
Contract with customer asset, balance 9,497 10,980
Deferred Revenue [Member]    
Contract with customer liability, balance $ 3,394 $ 2,434