Note 1 - Basis of Presentation (Tables)

3 Months Ended

Mar. 31, 2018

Notes Tables

Schedule of Weighted Average Number of Shares [Table Text Block]

	Three Months Ended
	March 31,
	2018		2017
Weighted-average shares outstanding-basic		89,058		71,877
Common stock equivalents for stock options and restricted stock		518		642
Weighted-average shares outstanding-diluted		89,576		72,519

Property, Plant and Equipment [Table Text Block]

							Estimated
	March 31,			December 31,			Useful Lives
	2018			2017			(in years)
Property and equipment:
Land	$	51,946		$	50,458
Buildings and improvements		156,973			156,924		7	to	40
Equipment		516,251			511,878		3	to	20
		725,170			719,260
Accumulated depreciation		(381,992	)		(368,602	)
Total property and equipment, net	$	343,178		$	350,658

Schedule of Disposal of Assets and Purchase of Property and Equipment [Table Text Block]

	Three Months Ended
	March 31,
	2018			2017
(Gain) loss on disposal of assets, net:
Proceeds from sale of assets	$	(41	)	$	(50	)
Proceeds from FCC - Repack		(937	)		-
Net book value of assets disposed		157			577
Total	$	(821	)	$	527
Purchase of property and equipment:
Recurring purchases - operations	$	4,292		$	3,977
Repack		1,988			-
Total	$	6,280		$	3,977