Note 12 - 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	6 Months Ended
	Jun. 30, 2019 $ / shares shares
Number of shares - Nonvested, beginning balance (in shares) | shares	1,185
Weighted average grant date fair value - Nonvested, beginning balance (in dollars per share) | $ / shares	$ 1.88
Number of shares - Granted (in shares) | shares	171
Weighted average grant date fair value - Granted (in dollars per share) | $ / shares	$ 1.65
Number of shares - Vested (in shares) | shares	(768)
Weighted average grant date fair value - Vested (in dollars per share) | $ / shares	$ 1.86
Number of shares - Canceled or expired (in shares) | shares	(208)
Weighted average grant date fair value - Canceled or expired (in dollars per share) | $ / shares	$ 1.96
Number of shares - Nonvested, ending balance (in shares) | shares	380
Weighted average grant date fair value - Nonvested, ending balance (in dollars per share) | $ / shares	$ 1.78