Acquisitions (Narratives) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Business Acquisition [Line Items]
Gain (Loss) on Disposition of Business	$ 0	$ (7,000)	$ 0	$ (176,000)
Unrealized Gain on Securities	146,000	37,000	487,000	174,000
Gain (Loss) on Disposition of Property Plant Equipment	2,638,000		(2,638,000)	0
UNITED STATES
Business Acquisition [Line Items]
Other Restructuring Costs	493,000	$ 249,000	1,606,000	$ 755,000
Subsequent Event [Member] | Office Building [Member] | Estimate of Fair Value Measurement [Member]
Business Acquisition [Line Items]
Proceeds from Sale of Buildings			6,363,000
Cost of Sales [Member] | FRANCE
Business Acquisition [Line Items]
Business Exit Costs			815,000
Selling and Marketing Expense [Member] | FRANCE
Business Acquisition [Line Items]
Business Exit Costs			94,000
General and Administrative Expense [Member]
Business Acquisition [Line Items]
Gain (Loss) on Disposition of Property Plant Equipment	449,000
General and Administrative Expense [Member] | FRANCE
Business Acquisition [Line Items]
Business Exit Costs	94,000		$ 327,000
Cost of products sold
Business Acquisition [Line Items]
Gain (Loss) on Disposition of Property Plant Equipment	$ 2,189,000