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, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Proceeds from sale of assets	$ 63	$ 90,900	$ 104	$ 90,950
Proceeds from FCC Repack (Note 1)	909		1,846
Net book value of assets disposed	(178)	(13,574)	(335)	(14,151)
Total	$ 794	$ 77,326	1,615	76,799
Recurring purchases - operations			9,704	10,287
Repack			10,211	128
Total			$ 19,915	$ 10,415