Note 9 - Share-based Compensation and Cash-based Incentive Compensation (Tables)
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9 Months Ended |
Sep. 30, 2019 |
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| Notes Tables |
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| Schedule of Unvested Restricted Stock Units Roll Forward [Table Text Block] |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Nonvested, December 31, 2018 | | | 3,355,917 | | | $ | 3.90 | | | Granted | | | 990,608 | | | | 4.51 | | | Forfeited (1) | | | (1,075,864 | ) | | | 3.12 | | | Nonvested, September 30, 2019 | | | 3,270,661 | | | | 4.34 | | |
| Schedule of Nonvested Restricted Stock Units, Vesting Schedule [Table Text Block] |
| | | | | | 2019 | | | 1,485,510 | | | 2020 | | | 852,535 | | | 2021 | | | 932,616 | | | Total | | | 3,270,661 | | |
| Share-based Payment Arrangement, Nonemployee Director Award Plan, Activity [Table Text Block] |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Nonvested, December 31, 2018 | | | 181,832 | | | $ | 3.08 | | | Granted | | | 46,360 | | | | 6.04 | | | Vested | | | (105,012 | ) | | | 2.67 | | | Nonvested, September 30, 2019 | | | 123,180 | | | | 4.55 | | |
| Schedule of Nonvested Restricted Stock, Vesting Schedule [Table Text Block] |
| | | | | | 2020 | | | 78,424 | | | 2021 | | | 29,300 | | | 2022 | | | 15,456 | | | Total | | | 123,180 | | |
| Share-based Payment Arrangement, Cost by Plan [Table Text Block] |
| | | Three Months Ended September 30, | | | Nine Months Ended September 30, | | | | | | | | | | | | | | | | | Share-based compensation expense from: | | | | | | | | | | | | | | | | | | Restricted stock units (1) | | $ | 1,178 | | | $ | 1,303 | | | $ | 2,219 | | | $ | 3,598 | | | Restricted Shares | | | 70 | | | | 70 | | | | 210 | | | | 210 | | | Total | | $ | 1,248 | | | $ | 1,373 | | | $ | 2,429 | | | $ | 3,808 | | |
| Schedule of Incentive Compensation Expense [Table Text Block] |
| | | Three Months Ended September 30, | | | Nine Months Ended September 30, | | | | | | | | | | | | | | | | | Share-based compensation included in: | | | | | | | | | | | | | | | | | | General and administrative expenses | | $ | 1,248 | | | $ | 1,373 | | | $ | 2,429 | | | $ | 3,808 | | | Cash-based incentive compensation included in: | | | | | | | | | | | | | | | | | | Lease operating expense (1) | | | 672 | | | | 837 | | | | 951 | | | | 2,240 | | | General and administrative expenses (1) | | | 1,679 | | | | 1,534 | | | | 5,017 | | | | 5,597 | | | Total charged to operating income | | $ | 3,599 | | | $ | 3,744 | | | $ | 8,397 | | | $ | 11,645 | | |