Note 12 - Retirement, Savings and Deferred Compensation Plans - Amounts Recognized in Accumulated Other Comprehensive Loss (Details) - Supplemental Employee Retirement Plan [Member] - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Prior service cost	$ 397	$ 460
Net loss	1,298	1,391
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax, Total	$ 1,695	$ 1,851

Note 12 - Retirement, Savings and Deferred Compensation Plans - Amounts Recognized in Accumulated Other Comprehensive Loss (Details) - Supplemental Employee Retirement Plan [Member] - USD ($)
$ in Thousands

Jun. 30, 2022

Dec. 31, 2021

$ 397

$ 460

Net loss

1,298

1,391

Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax, Total

$ 1,695

$ 1,851