Note 9 - Stock Incentive Plans - Summary of Activity for Restricted Stock Units, Long-term Incentive Awards and Non-employee Director Stock Compensation (Details) - Restricted Stock Units (RSUs) [Member] shares in Thousands	9 Months Ended
	Sep. 30, 2017 $ / shares shares
Number of shares - Nonvested (in shares) | shares	1,414
Weighted average grant date fair value - Nonvested (in dollars per share) | $ / shares	$ 1.79
Number of shares - Granted (in shares) | shares	618
Estimated fair value per share (in dollars per share) | $ / shares	$ 2.25
Number of shares - Vested (in shares) | shares	(773)
Weighted average grant date fair value - Vested (in dollars per share) | $ / shares	$ 1.85
Number of shares - Canceled or expired (in shares) | shares	(64)
Weighted average grant date fair value - Canceled or expired (in dollars per share) | $ / shares	$ 1.74
Number of shares - Nonvested (in shares) | shares	1,195
Weighted average grant date fair value - Nonvested (in dollars per share) | $ / shares	$ 1.99