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Note 8 - Provisions (Details) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Statutory federal income tax rate of 34% $ (33,181,000) $ (25,965,000) $ (18,796,000)
Stock-based compensation expense 894,000 551,000 513,000
NOL not benefitted 31,935,000 25,085,000 17,983,000
Other, net 352,000 329,000 300,000
Provision for taxes $ 0 $ 0 $ 0