Note 1 - Basis of Presentation - Disposal of Assets and Purchase of Property and Equipment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Proceeds from sale of assets	$ 1,000	$ 0	$ 3,000	$ 0
Proceeds from FCC Repack (Note 1)	5,000	1,000	17,000	2,000
Net book value of assets disposed	(2,000)	0	(4,000)	0
Other	(1,000)	0	(3,000)	0
Total	$ 3,000	$ 1,000	13,000	2,000
Recurring purchases - operations			14,000	10,000
Repack			30,000	10,000
Total			$ 44,000	$ 20,000