Note 6 - Senior Notes, Credit Facilities, and Capital Leases (Tables)

12 Months Ended

Dec. 31, 2015

Debt Disclosure [Abstract]

Schedule of Line of Credit Facilities [Table Text Block]

Interest rates:
Spread over the London Interbank Offer Rate	2.25	-	3.25%
Spread over alternative base rate	1.25	-	2.25%
Standby fee per annum on undrawn amounts	0.50%
Covenant financial ratios:
Senior leverage ratio (debt secured by liens/EBITDA)	not more than 2.50:1
Leverage ratio (total debt less unencumbered cash/EBITDA)(1)	not more than 5.00:1
Interest coverage ratio (EBITDA/interest expense)	not more than 3.00:1

Schedule of Future Minimum Lease Payments for Capital Leases [Table Text Block]

Twelve-month period ending December 31,
2016	$	9,055
2017		5,547
2018		3,159
2019		972
Total		18,733
Less: imputed interest		(1,157	)
Net capital lease obligation	$	17,576