Note 9 - Share-based Compensation and Cash-based Incentive Compensation (Tables)
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6 Months Ended |
Jun. 30, 2019 |
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| Notes Tables |
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| Schedule of Unvested Restricted Stock Units Roll Forward [Table Text Block] |
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| | | Nonvested, December 31, 2018 | | | 3,355,917 | | | $ | 3.90 | | | Granted | | | 988,800 | | | | 4.51 | | | Forfeited (1) | | | (897,828 | ) | | | 2.85 | | | Nonvested, June 30, 2019 | | | 3,446,889 | | | | 4.35 | | |
| Schedule of Nonvested Restricted Stock Units, Vesting Schedule [Table Text Block] |
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| | | 2019 | | | 1,555,740 | | | 2020 | | | 902,349 | | | 2021 | | | 988,800 | | | Total | | | 3,446,889 | | |
| 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, June 30, 2019 | | | 123,180 | | | | 4.55 | | |
| Schedule of Nonvested Restricted Stock, Vesting Schedule [Table Text Block] |
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| | | 2020 | | | 78,428 | | | 2021 | | | 29,300 | | | 2022 | | | 15,452 | | | Total | | | 123,180 | | |
| Share-based Payment Arrangement, Cost by Plan [Table Text Block] |
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Three Months Ended June 30, | | |
Six Months Ended June 30, | | | | |
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| | | Share-based compensation expense from: | | | | | | | | | | | | | | | | | | Restricted stock units (1) | | $ | 1,189 | | | $ | 1,145 | | | $ | 1,041 | | | $ | 2,294 | | | Restricted Shares | | | 70 | | | | 70 | | | | 140 | | | | 140 | | | Total | | $ | 1,259 | | | $ | 1,215 | | | $ | 1,181 | | | $ | 2,434 | | |
| Schedule of Incentive Compensation Expense [Table Text Block] |
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Three Months Ended June 30, | | |
Six Months Ended June 30, | | | | |
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| | | Share-based compensation included in: | | | | | | | | | | | | | | | | | | General and administrative expenses | | $ | 1,259 | | | $ | 1,215 | | | $ | 1,181 | | | $ | 2,434 | | | Cash-based incentive compensation included in: | | | | | | | | | | | | | | | | | | Lease operating expense (1) | | | 402 | | | | 543 | | | | 279 | | | | 1,403 | | | General and administrative expenses (1) | | | 1,243 | | | | 1,391 | | | | 3,338 | | | | 4,063 | | | Total charged to operating income | | $ | 2,904 | | | $ | 3,149 | | | $ | 4,798 | | | $ | 7,900 | | |