Note 6 - Senior Notes, Credit Facilities, and Capital Leases (Details) - Credit Facilities (USD $)	12 Months Ended
	Dec. 31, 2014
Covenant financial ratios:
Senior leverage ratio (debt secured by liens/EBITDA)	1
Leverage ratio (total debt less unencumbered cash/EBITDA)	1
Interest coverage ratio (EBITDA/interest expense) (in Dollars)	1
New Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]
Interest rates:
Basis spread	2.25%
New Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]
Interest rates:
Basis spread	3.25%
New Facility [Member] | Base Rate [Member] | Minimum [Member]
Interest rates:
Basis spread	1.25%
New Facility [Member] | Base Rate [Member] | Maximum [Member]
Interest rates:
Basis spread	2.25%
New Facility [Member]
Interest rates:
Standby fee per annum on undrawn amounts	0.50%
Covenant financial ratios:
Senior leverage ratio (debt secured by liens/EBITDA)	2.50
Leverage ratio (total debt less unencumbered cash/EBITDA)	4.00
Interest coverage ratio (EBITDA/interest expense) (in Dollars)	3.00