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Marketable Equity Securities (Details Narrative) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Mar. 31, 2018
May 02, 2016
Notes to Financial Statements          
Units Vendetta purchased         7,240,000
Aggregate consideration for units of Vendetta (common stock $186,000; Warrants $103,000)     $ 289    
Common shares Vendetta sold 1,480,000        
Proceeds from sale of Vendetta $ 259        
Cost of sale of Vendetta $ 38        
Vendetta warrants exercised and shares received 2,240,000 5,000,000      
US dollar cost of warrants exercised $ 167 $ 441      
Intrinsic value Vendetta Warrants 309        
Total value Vendetta Warrants $ 476        
Number of Vendetta shares owned   11,000,000   11,000,000