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Note 6 - Trade Receivables (Details Textual) - USD ($)
Jun. 30, 2022
Dec. 31, 2021
Jun. 30, 2021
Accounts Receivable, Allowance for Credit Loss, Current $ 2,618,000 $ 613,000 $ 1,062,000
Contract with Customer, Refund Liability, Current $ 1,309,000 $ 1,670,000 $ 2,057,000