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Note 1 - Description of Business and Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2018
Notes Tables |
Schedule of Principal Transactions Revenue [Table Text Block] |
|  | Year Ended December 31, |
|  | 2018 |  |  | 2017 |  |  | 2016 |
Trade revenue |  | $ | 2,897 |  |  | $ | 1,832 |  |  | $ | 2,069 |
Trade expense |  |  | (3,012 | ) |  |  | (1,863 | ) |  |  | (1,997 | )
Net trade (loss) income |  | $ | (115 | ) |  | $ | (31 | ) |  | $ | 72 |
Property, Plant and Equipment [Table Text Block] |
|  |  |  |  |  |  |  |  |  | Estimated |
|  | December 31, |  |  | Useful Lives |
|  | 2018 |  |  | 2017 |  |  | (in years) |
Property and equipment: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Land |  | $ | 52,511 |  |  | $ | 50,458 |  |  |  |  |  |  |
Buildings and improvements |  |  | 166,200 |  |  |  | 156,924 |  |  |  | 7 | to | 40 |
Equipment |  |  | 547,707 |  |  |  | 511,878 |  |  |  | 3 | to | 20 |
|  |  | 766,418 |  |  |  | 719,260 |  |  |  |  |  |  |
Accumulated depreciation |  |  | (403,276 | ) |  |  | (368,602 | ) |  |  |  |  |  |
Total property and equipment, net |  | $ | 363,142 |  |  | $ | 350,658 |  |  |  |  |  |  |
Schedule of Disposal of Assets and Purchase of Property and Equipment [Table Text Block] |
|  | Year ended December 31, |
|  | 2018 |  |  | 2017 |  |  | 2016 |
Gain (loss) on disposal of assets, net: |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of assets |  | $ | 8,967 |  |  | $ | 90,927 |  |  | $ | 44,234 |
Proceeds from Repack |  |  | 14,217 |  |  |  | 84 |  |  |  | - |
Net book value of assets disposed |  |  | (6,779 | ) |  |  | (16,811 | ) |  |  | (44,563 | )
Total |  | $ | 16,405 |  |  | $ | 74,200 |  |  | $ | (329 | )
Purchase of property and equipment: |  |  |  |  |  |  |  |  |  |  |  |
Recurring purchases - operations |  | $ | 40,983 |  |  | $ | 31,692 |  |  | $ | 43,604 |
Repack |  |  | 27,081 |  |  |  | 2,824 |  |  |  | - |
Repack related |  |  | 1,911 |  |  |  | - |  |  |  | - |
Total |  | $ | 69,975 |  |  | $ | 34,516 |  |  | $ | 43,604 |
Schedule of Weighted Average Number of Shares [Table Text Block] |
|  | Year Ended December 31, |
|  | 2018 |  |  | 2017 |  |  | 2016 |
Weighted-average shares outstanding, basic |  |  | 88,084 |  |  |  | 73,061 |  |  |  | 71,848 |
Weighted-average shares underlying stock options and restricted shares |  |  | 694 |  |  |  | 775 |  |  |  | 916 |
Weighted-average shares outstanding, diluted |  |  | 88,778 |  |  |  | 73,836 |  |  |  | 72,764 |
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] |
|  | December 31, |
|  | 2018 |  |  | 2017 |
Accumulated balances of items included in accumulated other comprehensive loss: |  |  |  |  |  |  |  |
Increase in pension liability |  | $ | (35,280 | ) |  | $ | (36,336 | )
Income tax benefit |  |  | (13,903 | ) |  |  | (14,171 | )
Accumulated other comprehensive loss |  | $ | (21,377 | ) |  | $ | (22,165 | )

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