Accounting Principles and Practices (Narratives) (Details)	12 Months Ended
	Mar. 31, 2022 USD ($) Segment Collective_Bargaining_Agreement Reporting_Unit	Mar. 31, 2021 USD ($) Reporting_Unit	Mar. 31, 2020 USD ($)
Accounting Policies [Line Items]
Standard and Extended Product Warranty Accrual	$ 2,173,000	$ 3,328,000	$ 3,581,000
Asset Impairment Charges			0
Advertising expenses	$ 2,410,000	$ 999,000	1,648,000
Number of reporting units | Reporting_Unit	3	2
Percentage of LIFO inventory	35.00%	39.00%
Research and development costs	$ 15,351,000	$ 12,405,000	11,310,000
Standard and Extended Product Warranty Accrual, Increase for Warranties Issued	1,274,000	2,319,000
Standard and Extended Product Warranty Accrual, Decrease for Payments	2,538,000	2,778,000
Foreign Currency Transaction Gain (Loss), before Tax	(1,574,000)	(941,000)	$ 1,514,000
Foreign Currency Translation [Abstract]
Other Asset Impairment Charges	$ 0
Number of Reportable Segments | Segment	1
Entity Well Known Seasoned Issuer	Yes
Warranty Obligations [Member]
Accounting Policies [Line Items]
Foreign Currency Transaction Gain (Loss), before Tax	$ 109,000	$ 206,000
Minimum
Accounting Policies [Line Items]
Estimated useful life of intangible assets	1 year
Minimum | Building and building equipment
Accounting Policies [Line Items]
Estimated useful lives of property plant and equipment	15 years
Minimum | Vehicles/Equipment
Accounting Policies [Line Items]
Estimated useful lives of property plant and equipment	3 years
Maximum
Accounting Policies [Line Items]
Estimated useful life of intangible assets	25 years
Maximum | Building and building equipment
Accounting Policies [Line Items]
Estimated useful lives of property plant and equipment	40 years
Maximum | Vehicles/Equipment
Accounting Policies [Line Items]
Estimated useful lives of property plant and equipment	18 years
Workforce Subject to Collective Bargaining Arrangements | Unionized Employees Concentration Risk
Accounting Policies [Line Items]
Percentage of employees	6.00%
Foreign Currency Translation [Abstract]
Number of collective bargaining agreements | Collective_Bargaining_Agreement	2
Short-term Contract with Customer [Member]
Accounting Policies [Line Items]
Revenue, Performance Obligation, Description of Warranty	12
Long-term Contract with Customer [Member]
Accounting Policies [Line Items]
Revenue, Performance Obligation, Description of Warranty	24 to 36