Note 8 - Loss Per Common Share - Loss Per Share, Basic and Diluted (Details) - USD ($)		3 Months Ended		6 Months Ended
		Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Net loss		$ (5,888,466)	$ (22,495,573)	$ (16,956,914)	$ (61,774,243)
Weighted Average Shares - Basic (in shares)		70,329,050	2,254,665	67,996,330	2,073,068
Weighted Average Shares - Diluted (in shares)		70,329,050	2,254,665	67,996,330	2,073,068
Basic loss per share * (in dollars per share)	[1]	$ (0.08)	$ (9.98)	$ (0.25)	$ (29.80)
Diluted loss per share * (in dollars per share)	[1]	$ (0.08)	$ (9.98)	$ (0.25)	$ (29.80)

[1] Adjusted to give effect for the 1 for 20 reverse stock split that became effective as of the opening of trading on August 5, 2016.