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Note 9 - Share Based Payments - Non-vested Stock Options (Details) - $ / shares
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Non-vested stock options, shares (in shares) 1,340,000 1,685,000
Non-vested stock options, Weighted average fair value (in dollars per share) $ 0.34 $ 0.36
Options granted, shares (in shares) 2,557,000 60,000
Options granted, Weighted average fair value (in dollars per share) $ 0.10 $ 0.06
Vested during period, shares (in shares) (200,000)
Vested during period, Weighted average fair value (in dollars per share) $ (0.52)
Options cancelled, shares (in shares) (1,760,000) (205,000)
Options cancelled, Weighted average fair value (in dollars per share) $ (0.29) $ (0.30)
Non-vested shares under option, shares (in shares) 2,137,000 1,340,000
Non-vested shares under option, Weighted average fair value (in dollars per share) $ 0.13 $ 0.34