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Note 6 - Prepaid Expenses and Other Current Assets - Prepaid Expenses and Other Current Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Prepaid service invoices $ 110 $ 76
Prepaid insurance premiums 265 233
Prepaid lease costs and receivables- short term 22 21
Interest and other receivables 108 135
Total $ 505 $ 465