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Note 5 - Prepaid Expenses and Other Current Assets - Summary of Prepaid Expenses and Other Current Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Prepaid insurance $ 149 $ 138
Tenant allowance 119 0
Prepaid inventory 91 368
Prepaid dues and subscriptions 39 18
Prepaid patents 12 9
Prepaid sales rebates 11 19
Prepaid rent   14
Prepaid consultants 0 68
Prepaid marketing costs 14  
Other 109 144
Total prepaid expenses and other current assets $ 544 $ 778