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Note 4 - Revenue Recognition - Contract Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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Trade receivables, included in accounts receivable* | [1] | $ 15,897 | $ 16,459
Contract assets, included in accounts receivable |  | 1,128 | 775
Contract liabilities, included in Deferred revenue - short-term |  | 3,656 | 3,565
Contract liabilities, included in Deferred revenue - long-term |  | $ 9,318 | $ 11,605
[1] | Exclusive of the BTC of $11,381 and $8,970, respectively, and net of allowances for bad debt of $55 and $48, respectively, as of the dates noted.

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