Note 10 - Retirement Plans (Tables)

12 Months Ended

Mar. 31, 2022

Notes Tables

Schedule of Changes in Projected Benefit Obligations [Table Text Block]

	Fiscal Year:
	2022			2021
Change in benefit obligation
Benefit obligation at beginning of year	$	286,063		$	278,227
Service cost		8,483			9,326
Interest cost		7,721			9,266
Actuarial (gain) loss		(972	)		17,712
Benefit payments and expenses		(26,294	)		(28,468	)
Benefit obligation at end of year	$	275,001		$	286,063
Change in plan assets
Fair value of plan assets at beginning of year	$	348,914		$	202,485
Actual return on plan assets		6,666			103,166
Employer contributions		-			73,000
Benefit payments and expenses		(27,713	)		(29,737	)
Fair value of plan assets at end of year	$	327,867		$	348,914
Funded status	$	52,866		$	62,851

Schedule of Amounts in Accumulated Other Comprehensive Income (Loss) to be Recognized over Next Fiscal Year [Table Text Block]

	Fiscal Year:
	2022			2021
Amounts Recognized in Accumulated Other Comprehensive Pre-Tax Loss
Prior service cost	$	(167	)	$	(258	)
Net loss		(36,136	)		(26,265	)
Accumulated other comprehensive pre-tax loss	$	(36,303	)	$	(26,523	)

Schedule of Defined Benefit Plans Disclosures [Table Text Block]

	Fiscal Year:
	2022			2021
Service cost including administration	$	9,508		$	10,627
Interest cost		7,721			9,266
Expected return on plan assets		(17,114	)		(15,804	)
Amortization of net loss		-			9,919
Prior service cost		91			91
Net periodic benefit cost	$	206		$	14,099

Defined Benefit Plan, Assumptions [Table Text Block]

	Fiscal Year:
	2022			2021
Weighted Average Assumptions for Balance Sheet Liability at End of Year:
Discount rate - projected benefit obligation		3.81	%		3.43	%
Rate of compensation increase		3.00	%		3.00	%
Mortality table	Pri-2012 Blue Collar Generational Table Improvement Scale MP-2021			Pri-2012 Blue Collar Generational Table Improvement Scale MP-2020
Weighted Average Assumptions for Benefit Cost at Beginning of Year:
Discount rate - benefit obligations		3.43	%		3.69	%
Discount rate - interest cost		2.68	%		3.30	%
Discount rate - service cost		3.75	%		3.87	%
Expected return on plan assets		5.00	%		7.25	%
Rate of compensation increase		3.00	%		3.00	%

Schedule of Allocation of Plan Assets [Table Text Block]

	Target			Percentage of Plan
	Allocation			Assets at March 31,
	2023			2022			2021
Equity securities		19	%		21	%		48	%
Debt securities		72	%		61	%		50	%
Real estate		6	%		7	%		-
Cash		-			7	%		2	%
Other		3	%		4	%		-
Total		100	%		100	%		100	%

Defined Benefit Plan, Plan Assets, Category [Table Text Block]

	Level 1		Level 2		Level 3		`	Subtotal		Measured at NAV (1)		Total
Equity securities	$	29,427	$	-	$	-		$	29,427	$	-	$	29,427
Held in common/collective trusts
Equity securities		-		-		-			-		40,969		40,969
Real estate		-		-		-			-		23,200		23,200
Debt securities		-		-		-			-		200,224		200,225
Cash/short-term investments (2)		-		-		-			-		22,224		22,224
Other investments		-		-		-			-		11,822		11,822
Fair value of plan assets	$	29,427	$	-	$	-		$	29,427	$	298,439	$	327,867

Schedule of Expected Contributions [Table Text Block]

Expected Employer Contributions	$	-
Expected Employee Contributions	$	-

Schedule of Expected Benefit Payments [Table Text Block]

2023			$	10,101
2024				10,773
2025				11,550
2026				12,349
2027				13,116
2028	-	2032		75,037