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Note 5 - Prepaid Expenses and Other Current Assets - Summary of Prepaid Expenses and Other Current Assets (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Prepaid inventory $ 335 $ 367
Prepaid dues and subscription 93 18
Prepaid insurance 77 138
Prepaid consultant 8 68
Prepaid patents 8 9
Prepaid sales rebates 3 19
Prepaid rent 0 14
Other 228 145
Total prepaid expenses and other current assets $ 752 $ 778