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Note 3 - Revenue Recognition - Assets and Liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Contract with customer liability, balance $ 8,731 $ 8,661
Trade Receivables [Member]    
Contract with customer asset, balance 12,063 14,644
Accrued Revenues [Member] | Licensing and Other [Member]    
Contract with customer asset, balance 2,174 1,833
Accrued Revenues [Member] | Royalty [Member]    
Contract with customer asset, balance 9,271 10,972
Deferred Revenue [Member]    
Contract with customer liability, balance $ 8,731 $ 8,661