XML 114 R100.htm IDEA: XBRL DOCUMENT v3.24.0.1
Note 18 - Pension and Postretirement Benefits - Summary of Weighted-average Assumptions Used in Calculating Net Periodic Benefit (Credit) Cost (Details)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Pension Plan and SERP Plan [Member]      
Discount rate 5.37% 5.49%  
Expected return on plan assets 6.50% 6.25%  
Cash balance interest credit rate 4.43% 2.57%  
Discount rate 5.48% 2.75% 2.49%
Expected return on plan assets 6.25% 6.25% 6.50%
Cash balance interest credit rate 4.43% 2.57% 2.57%
Other Postretirement Benefits Plan [Member]      
Discount rate 4.75% 5.25%  
Expected return on plan assets 1.75% 1.75%  
Discount rate 5.25% 2.25% 1.50%
Expected return on plan assets 1.75% 1.75% 2.00%