Note 9 - Senior Notes, Credit Facility, and Capital Leases - Credit Facilities (Details)		3 Months Ended
		Mar. 31, 2017	Dec. 31, 2016
Leverage ratio (total debt less unencumbered cash/EBITDA)			5
Maximum [Member]
Senior leverage ratio (debt secured by liens/EBITDA)		2.5
Leverage ratio (total debt less unencumbered cash/EBITDA)	[1]	4
Interest coverage ratio (EBITDA/interest expense)		3
New Facility [Member]
Standby fee per annum on undrawn amounts		0.50%
New Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]
Variable rate		2.25%
New Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]
Variable rate		3.25%
New Facility [Member] | Base Rate [Member] | Minimum [Member]
Variable rate		1.25%
New Facility [Member] | Base Rate [Member] | Maximum [Member]
Variable rate		2.25%

[1] The leverage ratio was amended for to be 5.00:1 for 2016, and reverted back to 4.00:1 effective January 1, 2017.