Note 6 - Senior Notes, Credit Facilities and Capital Leases (Details) - Credit Facilities	12 Months Ended
	Dec. 31, 2013
New Facility [Member]
Interest rates:
Standby fee per annum on undrawn amounts	0.50%
Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member] | Previous Facility [Member]
Interest rates:
Variable rate spread	3.00%
Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member] | New Facility [Member]
Interest rates:
Variable rate spread	2.25%
Minimum [Member] | Base Rate [Member] | Previous Facility [Member]
Interest rates:
Variable rate spread	2.00%
Minimum [Member] | Base Rate [Member] | New Facility [Member]
Interest rates:
Variable rate spread	1.25%
Minimum [Member] | Previous Facility [Member]
Interest rates:
Standby fee per annum on undrawn amounts	0.825%
Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member] | Previous Facility [Member]
Interest rates:
Variable rate spread	4.50%
Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member] | New Facility [Member]
Interest rates:
Variable rate spread	3.25%
Maximum [Member] | Base Rate [Member] | Previous Facility [Member]
Interest rates:
Variable rate spread	3.50%
Maximum [Member] | Base Rate [Member] | New Facility [Member]
Interest rates:
Variable rate spread	2.25%
Maximum [Member] | Previous Facility [Member]
Interest rates:
Standby fee per annum on undrawn amounts	1.05%