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Note 3 - Reserve for Sales Returns and Allowance - Reserve for Sales Returns and Allowances (Details) - Allowance For Sales Returns 1 [Member] - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Balance at the beginning of year $ 3,365 $ 2,112 $ 1,893
Provision for returns and allowances 4,911 7,699 4,334
Actual returns and allowances paid to customers (5,640) (6,446) (4,115)
Balance at the end of year $ 2,636 $ 3,365 $ 2,112