Quarterly report pursuant to Section 13 or 15(d)

Note 8 - Share-based Compensation and Cash-based Incentive Compensation - Summary of Compensation Expense Related to Share-Based Awards and Cash-Based Awards (Details)

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Note 8 - Share-based Compensation and Cash-based Incentive Compensation - Summary of Compensation Expense Related to Share-Based Awards and Cash-Based Awards (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Share-based compensation expense $ 1,075 $ 1,248 $ 3,142 $ 2,429
Total charged to operating income 1,229 3,599 7,935 8,397
General and Administrative Expense [Member]        
Share-based compensation expense 1,075 1,248 3,142 2,429
Cash-based incentive compensation [1] 154 1,679 3,944 5,017
Lease Operating Expense [Member]        
Cash-based incentive compensation [1] $ 0 $ 672 $ 849 $ 951
[1] Includes adjustments of accruals to actual payments.