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Note 5 - Prepaid Expenses and Other Current Assets - Summary of Prepaid Expenses and Other Current Assets (Details) - USD ($)
Jun. 30, 2022
Dec. 31, 2021
Prepaid inventory $ 218,000 $ 367,000
Prepaid insurance 142,000 138,000
Prepaid dues and subscriptions 70 18
Prepaid marketing costs 23  
Prepaid patents 11,000 9,000
Prepaid consultants 8 68
Prepaid sales rebates 6,000 19,000
Prepaid rent   14,000
Other 151,000 145,000
Total prepaid expenses and other current assets $ 629,000 $ 778,000