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Note 5 - Prepaid Expenses and Other Current Assets - Summary of Prepaid Expenses and Other Current Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Prepaid inventory $ 368 $ 0
Prepaid insurance 138 165
Prepaid consulting services 68 0
Prepaid sales rebates 19 144
Prepaid security deposit for lease 0 65
Prepaid dues and subscription 18 53
Prepaid rent 14 0
Prepaid patents 9 47
Other 144 102
Total prepaid expenses and other current assets $ 778 $ 576