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Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Statement of Financial Position [Abstract] |  |
Expendable parts, supplies and fuel, net of reserve of $4,323 and $2,748 | $ 4,323 | $ 2,748
Property and equipment (including $187,166 and $195,796 from VIEs, Note 7), net of accumulated depreciation of $598,546 and $484,510 | 598,546 | 484,510
PP&E from VIEs | 3,258,925 | 3,010,803
Deferred major maintenance, net of accumulated amortization of $57,022 and $34,423 | 57,022 | 34,423
Current maturities of long-term debt and finance lease obligations (including $17,610 and $17,327 from VIEs, Note 7), net of related costs of $7,527 and $5,694 | 7,527 | 5,694
Current maturities of notes payable, from VIEs | 689,345 | 612,584
Long-term debt and finance lease obligations (including $135,683 and $159,324 from VIEs, Note 7), net of current maturities and related costs of $15,926 and $17,930 | $ 15,926 | $ 17,930
Common stock, par value (in dollars per share) | $ 0.001 | $ 0.001
Common stock, shares authorized | 100,000,000 | 100,000,000
Common stock, shares issued | 23,097,737 | 22,835,715
Common stock, shares outstanding | 16,405,565 | 16,303,262
Treasury stock, shares | 6,692,172 | 6,532,453
Current maturities of notes payable, from VIEs | $ 689,345 | $ 612,584
Variable Interest Entity, Primary Beneficiary [Member] |  |
Statement of Financial Position [Abstract] |  |
PP&E from VIEs | 187,166 | 195,796
Current maturities of notes payable, from VIEs | 17,610 | 17,327
Long-term debt from VIEs | 135,683 | 159,324
Long-term debt from VIEs | 135,683 | 159,324
Current maturities of notes payable, from VIEs | $ 17,610 | $ 17,327

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