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Note 6 - Revenue, Deferred Revenue and Accounts Receivable - Summary of Changes in Deferred Revenue (Details) - USD ($) $ in Thousands | 12 Months Ended
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Nov. 30, 2021 | Nov. 30, 2020
Deferred revenue balance | $ 4,902 | $ 11
Net additions to deferred revenue | 33,641 | 18,826
Reductions in deferred revenue for revenue recognized during the fiscal year | (37,418) | (13,935)
Deferred revenue balance | $ 1,125 | $ 4,902

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