Note 10 - Retirement Plans (Tables)

12 Months Ended

Mar. 31, 2021

Notes Tables

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

	2021			2020
	(In thousands)
Change in Benefit Obligation
Benefit obligation at beginning of year	$	278,227		$	250,461
Service cost		9,326			9,244
Interest cost		9,266			9,064
Liability gain due to curtailment		-			(1,114	)
Actuarial loss		17,712			20,146
Benefit payments and expenses		(28,468	)		(9,574	)
Benefit obligation at end of year	$	286,063		$	278,227
Change in Plan Assets
Fair value of plan assets at beginning of year	$	202,485		$	233,112
Actual return on plan assets		103,166			(46,325	)
Employer contributions		73,000			26,000
Benefit payments and expenses		(29,737	)		(10,302	)
Fair value of plan assets at end of year	$	348,914		$	202,485
Funded (Unfunded) Status	$	62,851		$	(75,742	)

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

	2021			2020
	(In thousands)
Amounts Recognized in Accumulated Other Comprehensive Pre-Tax Loss
Prior service cost	$	(258	)	$	(349	)
Net loss		(26,265	)		(105,866	)
Accumulated other comprehensive pre-tax loss	$	(26,523	)	$	(106,215	)

Schedule of Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block]

	Pension and
	post retirement plan
	adjustments, net
	of tax
	(In thousands)
Accumulated Other Comprehensive Loss
Balance at March 31, 2020	$	(79,220	)
Other comprehensive income		60,153
Balance at March 31, 2021	$	(19,067	)

Schedule of Defined Benefit Plans Disclosures [Table Text Block]

	2021			2020
	(In thousands)
Service cost including administration	$	10,627		$	9,935
Interest cost		9,266			9,064
Expected return on plan assets		(15,804	)		(16,746	)
Amortization of net loss		9,919			579
Prior service cost		91			120
Net periodic benefit cost	$	14,099		$	2,952
Settlement/curtailment expense		-			118
Net periodic benefit cost with curtailment	$	14,099		$	3,070

Defined Benefit Plan, Assumptions [Table Text Block]

	2021			2020
Weighted Average Assumptions for Balance Sheet Liability at End of Year:
Discount rate - projected benefit obligation		3.43	%		3.69	%
Rate of compensation increase		3.00	%		3.00	%
Mortality table		Pri-2012 Blue Collar Generational Table Improvement Scale MP-2020			Pri-2012 Blue Collar Generational Table Improvement Scale MP-2019
Weighted Average Assumptions for Benefit Cost at Beginning of Year:
Discount rate - benefit obligations		3.69	%		4.14	%
Discount rate - interest cost		3.30	%		3.74	%
Discount rate - service cost		3.87	%		4.34	%
Discount rate - interest on service cost		3.43	%		3.69	%
Expected return on plan assets		7.25	%		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,
	2022			2021			2020
Plan Assets
Equity securities		50	%		48	%		97	%
Debt securities		50	%		50	%		-
Real estate		-			-			-
Cash		-			2	%		3	%
Total		100	%		100	%		100	%

Schedule of Expected Contributions [Table Text Block]

Expected Employer Contributions	$	-
Expected Employee Contributions	$	-

Schedule of Expected Benefit Payments [Table Text Block]

2022	$	11,178
2023		11,290
2024		11,913
2025		12,640
2026		13,342
2027-2031		75,496