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Note 3 - Revenue Recognition - Assets and Liabilities (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Contract with customer liability, balance | $ 2,395 | $ 3,593
Trade Receivables [Member] |  |
Contract with customer asset, balance | 10,461 | 9,971
Accrued Revenues [Member] | Licensing and Other [Member] |  |
Contract with customer asset, balance | 4,989 | 6,745
Accrued Revenues [Member] | Royalty [Member] |  |
Contract with customer asset, balance | 6,569 | 9,440
Deferred Revenue [Member] |  |
Contract with customer liability, balance | $ 2,395 | $ 3,593

X
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