Income Taxes (Narrative) (Details) - USD ($)	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Operating Loss Carryforwards [Line Items]
Tax Cuts and Jobs Act, Change in Tax Rate, Income Tax Expense (Benefit)			$ 525,000
Deferred Tax Liability Lease Asset	$ (10,130,000)	$ (8,446,000)
Deferred Tax Asset Lease Liability	10,872,000	$ 8,623,000
Effective Income Tax Rate Reconciliation, Deduction, Amount	$ 580,000		$ 1,029,000
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	21.00%	21.00%
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount	$ (2,482,000)	$ 810,000	$ (2,491,000)
Gross amounts of deferred tax assets	87,178,000	86,634,000
Valuation allowance	(16,147,000)	(15,103,000)
Foreign net operating losses	4,299,000
Foreign subsidiary income	42,127,000	30,894,000	37,577,000
Undistributed Earnings of Foreign Subsidiaries	115,000,000
Amount accrued for the payment of interest and penalties	62,000	57,000	46,000
Effective Income Tax Rate Reconciliation, Tax Credit, Amount	(700,000)	(700,000)	(1,903,000)
Federal tax credits (3)	700,000	700,000	800,000
Effective Income Tax Rate Reconciliation, Tax Credit, Other, Amount			$ 1,103,000
Deferred Tax Assets, Tax Credit Carryforwards, Foreign	11,825,000	11,900,000
State and foreign net operating loss carryforwards	10,075,000	7,404,000
Operating Loss Carryforwards	908,000
Magnetek [Member]
Operating Loss Carryforwards [Line Items]
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration	69,900,000
State and foreign net operating loss carryforwards	112,184,000
Dorner
Operating Loss Carryforwards [Line Items]
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration	13,752,000
Federal
Operating Loss Carryforwards [Line Items]
Foreign net operating losses	$ 4,322,000	$ 2,896,000