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Note 9 - Stock-based Compensation and Incentive Plans (Tables) | 12 Months Ended
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Dec. 31, 2021
Notes Tables |
Schedule Of Common Stock Shares Reserved For Issuance And Shares Available For Grant [Table Text Block] |
|  | Year Ended December 31, |
|  | 2021 |  |  | 2020 |  |  | 2019 |
Shares of common stock reserved for issuance under the plans |  |  | 6,473,228 |  |  |  | 3,973,228 |  |  |  | 3,973,228 |
Shares of common stock available for future grants |  |  | 3,037,187 |  |  |  | 1,591,577 |  |  |  | 2,187,101 |
Share-based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block] |
|  | Weighted-average |  |  | Time |  |  | Weight-average |  |  |  |  |
|  | Grant-Date |  |  | Based |  |  | Grant Date |  |  | Performance |
|  | Fair Value |  |  | Units |  |  | Fair Value |  |  | Based Units |
Non-vested balance at December 31, 2018 |  | $ | 24.21 |  |  |  | 1,081,084 |  |  | $ | 26.04 |  |  |  | 63,365 |
Granted |  |  | 23.44 |  |  |  | 186,143 |  |  |  | 24.50 |  |  |  | 101,143 |
Vested |  |  | 24.45 |  |  |  | (784,868 | ) |  |  | — |  |  |  | — |
Cancelled/forfeited |  |  | 24.70 |  |  |  | (78,591 | ) |  |  | 24.50 |  |  |  | (70,694 | )
Non-vested balance at December 31, 2019 |  | $ | 23.32 |  |  |  | 403,768 |  |  | $ | 25.54 |  |  |  | 93,814 |
Granted |  |  | 5.95 |  |  |  | 594,234 |  |  |  | — |  |  |  | — |
Vested |  |  | 24.05 |  |  |  | (265,919 | ) |  |  | 26.04 |  |  |  | (63,365 | )
Non-vested balance at December 31, 2020 |  | $ | 8.95 |  |  |  | 732,083 |  |  | $ | 24.50 |  |  |  | 30,449 |
Granted |  |  | 13.26 |  |  |  | 452,403 |  |  |  | — |  |  |  | — |
Vested |  |  | 10.97 |  |  |  | (406,604 | ) |  |  | — |  |  |  | — |
Cancelled/forfeited |  |  | 24.50 |  |  |  | (1,769 | ) |  |  | — |  |  |  | — |
Non-vested balance at December 31, 2021 |  | $ | 10.37 |  |  |  | 776,113 |  |  | $ | 24.50 |  |  |  | 30,449 |
Schedule Of Allocated Share Based Compensation Expense Recognized Period Costs [Table Text Block] |
(In Thousands) |  | Year Ended December 31, |
|  | 2021 |  |  | 2020 |  |  | 2019 |
Grant date fair value of restricted stock units vested |  | $ | 4,460 |  |  | $ | 6,395 |  |  | $ | 19,193 |
Restricted stock unit compensation expense |  |  | 5,638 |  |  |  | 5,117 |  |  |  | 19,603 |
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] |
|  | Weighted- |  |  |  |  |  |  | Weighted- |  |  |  |  |  |  | Weighted- |  |  |  |  |
|  | average |  |  | Time |  |  | average |  |  |  |  |  |  | average |  |  |  |  |
|  | Grant-Date |  |  | Based |  |  | Grant-Date |  |  | Series A |  |  | Grant-Date |  |  | Series B |
|  | Fair Value |  |  | Shares |  |  | Fair Value |  |  | Warrants |  |  | Fair Value |  |  | Warrants |
Non-vested balance at December 31, 2018 |  | $ | 226.50 |  |  |  | 4,517 |  |  | $ | 1.00 |  |  |  | 7,650 |  |  | $ | 2.94 |  |  |  | 8,269 |
Vested |  |  | 226.50 |  |  |  | (4,517 | ) |  |  | 1.00 |  |  |  | (7,650 | ) |  |  | 2.94 |  |  |  | (8,269 | )
Non-vested balance at December 31, 2019 |  | $ | — |  |  |  | — |  |  | $ | — |  |  |  | — |  |  | $ | — |  |  |  | — |

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