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Note 4 - Prepaid Expenses and Other Current Assets - Prepaid Expenses and Other Current Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Prepaid service invoices $ 76 $ 116
Prepaid manufacturing and mold costs 11
Prepaid insurance premiums 261 210
Total $ 348 $ 326