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Note 8 - Common Stock - Activity of Stock Option Plan (Details)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2017
USD ($)
$ / shares
shares
Outstanding, options (in shares) | shares 3,499,475
Outstanding, weighted average exercise price, options (in dollars per share) | $ / shares $ 1.21
Granted, options (in shares) | shares 3,680,000
Granted, weighted average exercise price, options (in dollars per share) | $ / shares $ 0.05
Forfeited or expired, options (in shares) | shares (155,200)
Forfeited or expired, weighted average exercise price, options (in dollars per share) | $ / shares $ 15.25
Outstanding, options (in shares) | shares 7,024,275
Outstanding, weighted average exercise price, options (in dollars per share) | $ / shares $ 0.29
Outstanding, weighted average exercise price, options (Year) 8 years 292 days
Outstanding, weighted average exercise price, options | $ $ 0
Exercisable, options (in shares) | shares 1,951,484
Exercisable at March 31, 2016, weighted average exercise price, options (in dollars per share) | $ / shares $ 0.90
Exercisable at March 31, 2016, weighted average exercise price, options (Year) 6 years 219 days
Exercisable at March 31, 2016, weighted average exercise price, options | $ $ 0