XML 59 R48.htm IDEA: XBRL DOCUMENT v3.21.2
Note 7 - Retirement Plans (Details Textual) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Defined Contribution Plan, Expected Contributions, Remainder of Fiscal Year $ 2  
Profit Sharing Contribution [Member]    
Defined Contribution Plan, Employer Discretionary Contribution Amount 11 $ 7
Pension Plan [Member] | Gray Pension Plan [Member]    
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year $ 4