Note 1 - Basis of Presentation - Disposal of Assets and Purchase of Property and Equipment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Proceeds from sale of assets	$ 112	$ 22	$ 216	$ 90,972
Proceeds from Repack (Note 1)	4,392		6,238
Net book value of assets disposed	(932)	(1,682)	(1,267)	(15,833)
Total	$ 3,572	$ (1,660)	5,187	75,139
Recurring purchases - operations			16,098	20,983
Repack			17,256	443
Repack related			1,540
Total			$ 34,894	$ 21,426