Note 10 - Long-term Debt (Tables)

3 Months Ended

Mar. 31, 2015

Debt Disclosure [Abstract]

Schedule of Debt [Table Text Block]

	December 31,		March 31,
	2014		2015
	(in thousands)
Senior Unsecured Notes Payable (a)	$	250,000	$	250,000
Senior Secured Revolving Credit Facility, Bank of America, N.A. (b)		143,853		140,000
Working capital facilities, Barclays (c)		40,396		38,447
		434,249		428,447
Less current portion		40,396		—
	$	393,853	$	428,447

Schedule of Guarantor Obligations [Table Text Block]

Pricing Tier		Consolidated Senior Secured Leverage Ratio					Commitment Fee/Unused Line Fee			Letter of Credit Fee			Eurocurrency Rate Loans			Base Rate Loans
	1	≥	2.50	to 1.0				0.50	%		3.75	%		3.75	%		2.75	%
	2	≥	2.00	to 1.0 but <	2.50	to 1.0		0.45	%		3.50	%		3.50	%		2.50	%
	3	≥	1.50	to 1.0 but <	2.00	to 1.0		0.40	%		3.25	%		3.25	%		2.25	%
	4	≥	1.00	to 1.0 but <	1.50	to 1.0		0.35	%		3.00	%		3.00	%		2.00	%
	5			<	1.00	to 1.0		0.30	%		2.75	%		2.75	%		1.75	%