Annual report pursuant to Section 13 and 15(d)

Note 2 - Risks and Uncertainties (Details Textual)

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Note 2 - Risks and Uncertainties (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Retained Earnings (Accumulated Deficit), Ending Balance $ (45,968) $ (40,234)  
Net Income (Loss) Attributable to Parent, Total (5,734) (4,260)  
Net Cash Provided by (Used in) Operating Activities, Total (5,696) (3,900)  
Cash, Ending Balance 16,823 1,353 $ 1,736
Working Capital 16,700    
Stockholders' Equity Attributable to Parent, Ending Balance $ 17,025 $ 799 $ 1,111