Note O - Employee and Director Benefit Plans - Reconciliation of Fund Status (Details) - Other Postretirement Benefits Plan [Member] $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($)
Accumulated postretirement benefit obligation	$ (3,121)
Fair value of plan assets	0
Funded status	(3,121)
Service cost, accumulated postretirement benefit obligation	(60)
Service cost, funded status	(60)
Interest cost, accumulated postretirement benefit obligation	(145)
Interest cost, funded status	(145)
Gains/(Losses), accumulated postretirement benefit obligation	39
Gains/(Losses)	39
Benefits paid, accumulated postretirement benefit obligation	118
Benefits paid, fair value of plan assets	(118)
Participant contributions, accumulated postretirement benefit obligation	(62)
Participant contributions, fair value of plan assets	62
Employer Contributions, accumulated postretirement benefit obligation	0
Employer Contributions, fair value of plan assets	56
Employer Contributions, funded status	56
Accumulated postretirement benefit obligation	(3,231)
Fair value of plan assets	0
Funded status	$ (3,231)