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Note 13 - Segment Reporting - Summary of Valuation and Qualifying Accounts (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Balance at beginning of period $ 541 $ 222
Charged to costs and expenses 0 319
Write-offs during period 6 0
Balance at end of period $ 535 $ 541