Note 11 - Share-based Awards and Cash-based Awards (Tables)
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12 Months Ended |
Dec. 31, 2019 |
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| Notes Tables |
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| Schedule of Unvested Restricted Stock Units Roll Forward [Table Text Block] |
| | | | | | | | | | | | | | | | | Weighted Average Grant Date Fair Value Per Share | | | | | | Weighted Average Grant Date Fair Value Per Share | | | | | | Weighted Average Grant Date Fair Value Per Share | | | Nonvested, beginning of period | | | 3,355,917 | | | $ | 3.90 | | | | 5,765,251 | | | $ | 2.48 | | | | 6,107,248 | | | $ | 2.73 | | | Granted | | | 994,698 | | | | 4.51 | | | | 988,955 | | | | 6.90 | | | | 2,128,879 | | | | 2.76 | | | Vested | | | (1,475,373 | ) | | | 2.76 | | | | (2,261,665 | ) | | | 2.21 | | | | (2,108,553 | ) | | | 3.45 | | | Forfeited | | | (1,260,520 | ) | | | 3.37 | | | | (1,136,624 | ) | | | 2.68 | | | | (362,323 | ) | | | 2.87 | | | Nonvested, end of period | | | 1,614,722 | | | $ | 5.73 | | | | 3,355,917 | | | $ | 3.90 | | | | 5,765,251 | | | $ | 2.48 | | |
| Schedule of Nonvested Restricted Stock Units, Vesting Schedule [Table Text Block] |
| | | | | | 2020 | | | 821,656 | | | 2021 | | | 793,066 | | | Total | | | 1,614,722 | | |
| Share-based Payment Arrangement, Nonemployee Director Award Plan, Activity [Table Text Block] |
| | | | | | | | | | | | | | | | | Weighted Average Grant Date Fair Value Per Share | | | | | | Weighted Average Grant Date Fair Value Per Share | | | | | | Weighted Average Grant Date Fair Value Per Share | | | Nonvested, beginning of period | | | 181,832 | | | $ | 3.08 | | | | 246,528 | | | $ | 2.27 | | | | 161,296 | | | $ | 3.47 | | | Granted | | | 46,360 | | | | 6.04 | | | | 41,544 | | | | 6.74 | | | | 147,372 | | | | 1.90 | | | Vested | | | (105,012 | ) | | | 2.67 | | | | (106,240 | ) | | | 2.64 | | | | (62,140 | ) | | | 4.51 | | | Nonvested, end of period | | | 123,180 | | | $ | 4.55 | | | | 181,832 | | | $ | 3.08 | | | | 246,528 | | | $ | 2.27 | | |
| Schedule of Nonvested Restricted Stock, Vesting Schedule [Table Text Block] |
| | | | | | 2020 | | | 78,428 | | | 2021 | | | 29,304 | | | 2022 | | | 15,448 | | | Total | | | 123,180 | | |
| Share-based Payment Arrangement, Cost by Plan [Table Text Block] |
| | | | | | | | | | | | | | | | | Share-based compensation expense from: | | | | | | | | | | | | | | Restricted stock units | | $ | 3,410 | | | $ | 3,260 | | | $ | 7,785 | | | Restricted stock | | | 280 | | | | 280 | | | | 280 | | | Total | | $ | 3,690 | | | $ | 3,540 | | | $ | 8,065 | | |
| Schedule of Incentive Compensation Expense [Table Text Block] |
| | | | | | | | | | | | | | | | | Share-based compensation included in: | | | | | | | | | | | | | | General and administrative | | $ | 3,690 | | | $ | 3,540 | | | $ | 8,065 | | | Cash-based incentive compensation included in: | | | | | | | | | | | | | | Lease operating expense | | | 2,206 | | | | 3,596 | | | | 2,101 | | | General and administrative | | | 8,897 | | | | 9,586 | | | | 5,032 | | | Total charged to operating income | | $ | 14,793 | | | $ | 16,722 | | | $ | 15,198 | | |