Note 9 - Senior Notes, Credit Facilities, and Capital Leases (Details) - Credit Facilities	6 Months Ended
	Jun. 30, 2014
Interest rates:
Standby fee per annum on undrawn amounts	0.50%
London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]
Interest rates:
Variable Interest Rates	2.25%
London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]
Interest rates:
Variable Interest Rates	3.25%
Base Rate [Member] | Minimum [Member]
Interest rates:
Variable Interest Rates	1.25%
Base Rate [Member] | Maximum [Member]
Interest rates:
Variable Interest Rates	2.25%
Senior Leverage Ratio [Member]
Covenant financial ratios:
Covenant	not more than 2.50:1
Leverage Ratio [Member]
Covenant financial ratios:
Covenant	not more than 4.00:1
Interest Coverage Ratio [Member]
Covenant financial ratios:
Covenant	not more than 3.00:1