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Note 4 - Prepaid Expenses and Other Current Assets - Summary of Prepaid Expenses and Other Current Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Prepaid inventory $ 93 $ 211
Prepaid insurance 73 146
Prepaid dues and subscriptions 65 43
Prepaid marketing costs 26 24
Prepaid patents 4 12
Tenant allowance 0 11
Other 72 113
Total prepaid expenses and other current assets $ 333 $ 560