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Note 5 - Prepaid Expenses and Other Current Assets - Prepaid Expenses and Other Current Assets (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Amounts owed to the Company from sale of common stock $ 14,130
All other non-trade receivables 239 73
Prepaid assets 889 639
Total prepaid expenses and other current assets $ 15,258 $ 712