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Income Taxes (Narrative) (Details) - USD ($)
 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
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 $ (8,446,000) (8,938,000)  
Deferred Tax Asset Lease Liability 8,623,000 9,048,000  
Effective Income Tax Rate Reconciliation, Deduction, Amount $ 0 $ 1,029,000 $ 945,000
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 $ 810,000 $ (2,491,000) $ (1,663,000)
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount     1,500,000
Gross amounts of deferred tax assets 86,634,000 93,401,000  
Valuation allowance (15,103,000) (15,036,000)  
Foreign net operating losses 10,552,000    
Foreign subsidiary income 30,894,000 37,577,000 14,362,000
Undistributed Earnings of Foreign Subsidiaries 69,000,000    
Income Tax Effects Allocated Directly to Equity, Employee Stock Options 283,000 169,000  
Amount accrued for the payment of interest and penalties 57,000 46,000 38,000
Effective Income Tax Rate Reconciliation, Tax Credit, Amount (700,000) (1,903,000)  
Federal tax credits (5) 700,000 800,000 $ (1,376,000)
Effective Income Tax Rate Reconciliation, Tax Credit, Other, Amount   1,103,000  
Deferred Tax Assets, Tax Credit Carryforwards, Foreign 11,900,000 11,800,000  
State and foreign net operating loss carryforwards 7,404,000 7,142,000  
Magnetek [Member]      
Operating Loss Carryforwards [Line Items]      
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration 76,371,000    
State and foreign net operating loss carryforwards 77,889,000    
Federal      
Operating Loss Carryforwards [Line Items]      
Foreign net operating losses $ 2,896,000 $ 2,696,000