Note 8 - Accounting for Share-based Payment Arrangement Compensation	3 Months Ended
Mar. 31, 2021
Notes to Financial Statements
Share-based Payment Arrangement [Text Block]	(8) Accounting for Share-based Payment Arrangement Compensation We account for share-based payment arrangements in accordance with Financial Accounting Standards Board, or FASB, Accounting Standards Codification, or ASC, 718, Compensation – Stock Compensation. During the first three months of 2021, there were no significant changes to the structure of our stock-based award plans. Pre-tax compensation expense related to stock options and performance unit awards recorded in the first three months of 2021 and 2020 was $336,000 and $246,000, respectively.

Note 8 - Accounting for Share-based Payment Arrangement Compensation

3 Months Ended

Mar. 31, 2021

Share-based Payment Arrangement [Text Block]

(8) Accounting for Share-based Payment Arrangement Compensation

We account for share-based payment arrangements in accordance with Financial Accounting Standards Board, or FASB, Accounting Standards Codification, or ASC, 718, Compensation – Stock Compensation. During the first three months of 2021, there were no significant changes to the structure of our stock-based award plans. Pre-tax compensation expense related to stock options and performance unit awards recorded in the first three months of 2021 and 2020 was $336,000 and $246,000, respectively.