Note 2 - Accrued Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Accrued expenses	$ 12,903	$ 7,940
Vacation	5,353	4,782
Accrued liability to MWL	3,026	4,284
Salaries and wages	1,839	2,644
Other	3,718	1,984
	$ 26,839	$ 21,634