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Note 8 - Revenue, Deferred Revenue and Accounts Receivable - Summary of Changes in Deferred Revenue (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
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May 31, 2022 | Nov. 30, 2021
Deferred revenue balance, beginning of period | $ 1,125 | $ 4,902
Net additions to deferred revenue during the period | 13,095 | 33,641
Reductions in deferred revenue for revenue recognized during the period | (13,453) | (37,418)
Deferred revenue balance, end of period | 767 | 1,125
Less current portion | 357 | 720
Deferred revenue, non-current | $ 410 | $ 405

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