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Note 1 - Basis of Presentation (Tables) | 9 Months Ended
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Sep. 30, 2018
Notes Tables |
Schedule of Weighted Average Number of Shares [Table Text Block] |
|  | Three Months Ended |  |  | Nine Months Ended |
|  | September 30, |  |  | September 30, |
|  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Weighted-average shares outstanding-basic |  |  | 87,765 |  |  |  | 71,636 |  |  |  | 88,191 |  |  |  | 71,777 |
Common stock equivalents for stock options and restricted stock |  |  | 800 |  |  |  | 818 |  |  |  | 619 |  |  |  | 714 |
Weighted-average shares outstanding-diluted |  |  | 88,565 |  |  |  | 72,454 |  |  |  | 88,810 |  |  |  | 72,491 |
Property, Plant and Equipment [Table Text Block] |
|  |  |  |  |  |  |  |  |  | Estimated |
|  | September 30, |  |  | December 31, |  |  | Useful Lives |
|  | 2018 |  |  | 2017 |  |  | (in years) |
Property and equipment: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Land |  | $ | 51,878 |  |  | $ | 50,458 |  |  |  |  |  |  |
Buildings and improvements |  |  | 159,024 |  |  |  | 156,924 |  |  |  | 7 | to | 40 |
Equipment |  |  | 532,422 |  |  |  | 511,878 |  |  |  | 3 | to | 20 |
|  |  | 743,324 |  |  |  | 719,260 |  |  |  |  |  |  |
Accumulated depreciation |  |  | (399,521 | ) |  |  | (368,602 | ) |  |  |  |  |  |
Total property and equipment, net |  | $ | 343,803 |  |  | $ | 350,658 |  |  |  |  |  |  |
Schedule of Disposal of Assets and Purchase of Property and Equipment [Table Text Block] |
|  | Three Months Ended |  |  | Nine Months Ended |
|  | September 30 |  |  | September 30 |
|  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Gain (loss) on disposal of assets, net: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of assets |  | $ | 112 |  |  | $ | 22 |  |  | $ | 216 |  |  | $ | 90,972 |
Proceeds from Repack |  |  | 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 |
Purchase of property and equipment: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Recurring purchases - operations |  |  |  |  |  |  |  |  |  | $ | 16,098 |  |  | $ | 20,983 |
Repack |  |  |  |  |  |  |  |  |  |  | 17,256 |  |  |  | 443 |
Repack related |  |  |  |  |  |  |  |  |  |  | 1,540 |  |  |  | - |
Total |  |  |  |  |  |  |  |  |  | $ | 34,894 |  |  | $ | 21,426 |

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