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Note 6 - Share-based Payments (Tables) | 9 Months Ended
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Sep. 30, 2020
Notes Tables |
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block] |
Award | Grant Date |  | Shares/ Units Granted |  |  | Weighted Average Grant-Date Fair Value per Award |  | Vesting
Restricted Stock Units Granted: |  |  |  |  |  |  |  |  |  |
With Dividend Equivalent: |  |  |  |  |  |  |  |  |  |
To Key Management Employees | February 3, 2020 |  |  | 3,000 |  |  | $ | 54.0450 |  | 25% per year through February 6, 2024
To Executive Officers | February 12, 2020 |  |  | 15,300 |  |  | $ | 54.0607 |  | 25% per year through February 6, 2024
Without Dividend Equivalent: |  |  |  |  |  |  |  |  |  |
To Nonexecutive Employees | April 20, 2020 |  |  | 14,975 |  |  | $ | 40.18 |  | 100% April 8, 2024
Stock Performance Awards Granted: |  |  |  |  |  |  |  |  |  |
Under Executive Agreement | February 12, 2020 |  |  | 47,600 |  |  | $ | 47.10 |  | December 31, 2022
Under Legacy Agreement | February 12, 2020 |  |  | 7,400 |  |  | $ | 52.20 |  | December 31, 2022
Restricted Stock Granted to Nonemployee Directors | April 20, 2020 |  |  | 17,400 |  |  | $ | 44.85 |  | 33% per year through April 8, 2023
Share-based Payment Arrangement, Activity [Table Text Block] |
|  | Three months ended |  |  | Nine months ended |
|  | September 30, |  |  | September 30, |
(in thousands) |  | 2020 |  |  | 2019 |  |  | 2020 |  |  | 2019 |
Stock Performance Awards Granted to Executive Officers |  | $ | 758 |  |  | $ | 743 |  |  | $ | 3,170 |  |  | $ | 3,274 |
Restricted Stock Dividend Equivalent Units Granted to Executive Officers and Key Employees |  |  | 106 |  |  |  | 189 |  |  |  | 891 |  |  |  | 999 |
Restricted Stock Granted to Nonemployee Directors |  |  | 237 |  |  |  | 203 |  |  |  | 677 |  |  |  | 572 |
Restricted Stock Units Granted to Nonexecutive Employees |  |  | 133 |  |  |  | 112 |  |  |  | 408 |  |  |  | 346 |
ESPP (15% discount) |  |  | 41 |  |  |  | 54 |  |  |  | 136 |  |  |  | 54 |
Totals |  | $ | 1,275 |  |  | $ | 1,301 |  |  | $ | 5,282 |  |  | $ | 5,245 |

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