Note 10 - Options and Stock Awards Activity (Details)	12 Months Ended
	Dec. 31, 2015 USD ($) $ / shares shares
Employee Stock Option [Member]
Outstanding (in shares) | shares	96,961
Outstanding (in dollars per share) | $ / shares	$ 1.23
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | shares
Granted (in dollars per share) | $ / shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares | shares	167
Vested (in dollars per share) | $ / shares	$ 1.23
Forfeited (in shares) | shares	96,794
Forfeited (in dollars per share) | $ / shares
Outstanding (in shares) | shares
Outstanding (in dollars per share) | $ / shares
Expected to Vest after December 31, 2015 (in shares) | shares
Expected to Vest after December 31, 2015 (in dollars per share) | $ / shares
Stock Awards [Member]
Outstanding (in shares) | shares	4,583,421
Outstanding (in dollars per share) | $ / shares	$ 1.80
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | shares	428,214
Granted (in dollars per share) | $ / shares	$ 4.33
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares | shares	364,121
Vested (in dollars per share) | $ / shares
Forfeited (in shares) | shares	222,680
Forfeited (in dollars per share) | $ / shares
Outstanding (in shares) | shares	4,424,834
Outstanding (in dollars per share) | $ / shares	$ 1.98
Expected to Vest after December 31, 2015 (in shares) | shares	4,424,834
Expected to Vest after December 31, 2015 (in dollars per share) | $ / shares	$ 1.98
Outstanding	5 years 164 days
Outstanding | $	$ 44,248
Expected to Vest after December 31, 2015	5 years 164 days
Expected to Vest after December 31, 2015 | $	$ 44,248