Note 3 - Equity Investment - Summary of Financial Information for Matrix (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Current assets	$ 299,872		$ 288,103
Current liabilities	258,523		227,796
Revenue	399,494	$ 382,036
Operating income	6,788	8,304
Net loss	(4,325)	$ 2,235
Matrix [Member]
Current assets	35,899		28,589
Long-term assets	609,429		614,841
Current liabilities	31,198		25,791
Long-term liabilities	227,953		$ 281,348
Revenue	55,855
Operating income	1,008
Net loss	$ (1,857)