Note 2 - Income Per Share - Basic and Diluted Income (Loss) Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Net income (loss)	$ 1,169	$ (4,463)	$ 2,029	$ (2,703)
Weighted average shares outstanding (in shares)	76,315,973	76,769,339	76,111,405	76,296,825
Weighted average restricted shares vested not delivered (in shares)	2,262,001	2,799,871	2,452,857	3,092,306
Total basic weighted average shares outstanding (in shares)	78,577,974	79,569,210	78,564,262	79,389,131
Dilutive effect of assumed conversion of warrants (in shares)	0	0	0	0
Total diluted weighted average shares outstanding (in shares)	79,172,578	79,569,210	79,214,619	79,389,131
Basic (in dollars per share)	$ 0.01	$ (0.06)	$ 0.03	$ (0.03)
Diluted (in dollars per share)	$ 0.01	$ (0.06)	$ 0.03	$ (0.03)
Restricted Stock Units (RSUs) [Member]
Dilutive effect of assumed conversion of share-based payment arrangement (in shares)	594,604	0	650,357	0
Share-based Payment Arrangement, Option [Member]
Dilutive effect of assumed conversion of share-based payment arrangement (in shares)	0	0	0	0