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Condensed Consolidated Statements of Operations and Retained Earnings - USD ($)	3 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Revenues [Abstract]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 212,712,000	$ 224,992,000
Cost of Goods and Services Sold	137,100,000	145,345,000
Gross Profit	75,612,000	79,647,000
Operating Expenses [Abstract]
Selling expenses	22,755,000	25,567,000
General and administrative expenses	19,600,000	21,826,000
Research and Development Expense	2,792,000	3,748,000
Impairment of Long-Lived Assets to be Disposed of	169,000	11,100,000
Amortization of intangibles	3,253,000	3,903,000
Operating Expenses	48,569,000	66,144,000
Income from operations	27,043,000	13,503,000
Other Income & Expenses [Abstract]
Interest and debt expense	3,852,000	4,607,000
Investment (income) loss	(302,000)	(268,000)
Foreign currency exchange (gain) loss	(410,000)	(276,000)
Other (income) expense, net	162,000	(40,000)
Income Tax Expense Benefit [Abstract]
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest	23,741,000	9,480,000
Income tax expense	5,162,000	1,774,000
Net income (loss)	18,579,000	7,706,000
Dividends	0	0
Retained Earnings Accumulated Deficit [Abstract]
Retained earnings - beginning of period	236,459,000	197,897,000
Retained earnings - end of period	$ 255,038,000	$ 206,491,000
Weighted Average Number Of Shares Outstanding Basic [Abstract]
Average basic shares outstanding	23,431,000	23,115,000
Weighted Average Number Of Shares Outstanding [Abstract]
Average diluted shares outstanding	23,777,000	23,610,000
Earnings Per Share Basic [Abstract]
Basic income (loss) per share:	$ 0.79	$ 0.33
Earnings Per Share Diluted [Abstract]
Diluted income (loss) per share:	0.78	$ 0.33
Common Stock, Dividends, Per Share, Declared	$ 0.06
Accounting Standards Update 2016-01 [Member]
Retained Earnings Accumulated Deficit [Abstract]
Cumulative Effect of New Accounting Principle in Period of Adoption		$ 888,000

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