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Note 6 - Trade Receivables (Details Textual) - USD ($)
Mar. 31, 2022
Dec. 31, 2021
Mar. 31, 2021
Accounts Receivable, Allowance for Credit Loss, Current $ 1,730,000 $ 613,000 $ 394,000
Contract with Customer, Refund Liability, Current $ 2,079,000 $ 1,670,000 $ 1,619,000