Note 11 - Share Based Compensation and Employee Benefit Plans - Non-vested Options (Details) - $ / shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Non-vested at January 1, 2016 (in shares)	1,919,873
Non-vested at January 1, 2016 (in dollars per share)	$ 12.30
Granted (in shares)	493,088
Granted (in dollars per share)	$ 6.54	$ 11.27	$ 15.86
Vested (in shares)	(527,883)
Vested (in dollars per share)	$ 10.56
Forfeited (in shares)	(3,500)
Forfeited (in dollars per share)	$ 9.24
Non-vested at December 31, 2016 (in shares)	1,881,578	1,919,873
Non-vested at December 31, 2016 (in dollars per share)	$ 11.28	$ 12.30