Note 9 - Debt, Credit Facilities and Leases - Credit Facility (Details)	6 Months Ended
	Jun. 30, 2019
Senior leverage ratio (debt secured by liens/EBITDA)	2.50	[1]
Leverage ratio (total debt less unencumbered cash/EBITDA)	4.50	[1]
Interest coverage ratio (EBITDA/interest expense)	3.00	[1]
New Facility [Member]
Standby fee per annum on undrawn amounts	0.50%
New Facility [Member] | Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member]
Variable rate	2.25%
New Facility [Member] | Minimum [Member] | Base Rate [Member]
Variable rate	1.25%
New Facility [Member] | Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member]
Variable rate	3.25%
New Facility [Member] | Maximum [Member] | Base Rate [Member]
Variable rate	2.25%

[1] EBITDA is calculated as defined in the credit agreement.