Condensed Consolidated Statements of Operations and Retained Earnings - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014
Revenues [Abstract]
Net sales	$ 159,738	$ 140,791	$ 442,015	$ 430,714
Cost of products sold	111,397	97,382	303,145	294,584
Gross profit	48,341	43,409	138,870	136,130
Operating Expenses [Abstract]
Selling expenses	19,295	17,398	53,292	52,434
General and administrative expenses	16,399	12,845	53,541	40,224
Amortization of intangibles	1,689	551	3,276	1,716
Total operating expenses	37,383	30,794	110,109	94,374
Income from operations	10,958	12,615	28,761	41,756
Other Income & Expenses [Abstract]
Interest and debt expense	2,425	3,344	5,213	9,977
Investment (income) loss	(164)	(1,016)	(668)	(1,683)
Foreign currency exchange loss (gain)	476	247	1,750	36
Other expense (income), net	(189)	(181)	(302)	(289)
Income before income tax expense	8,410	10,221	22,768	33,715
Income Tax Expense Benefit [Abstract]
Income tax expense	1,183	2,360	9,078	8,522
Net income	7,227	7,861	13,690	25,193
Retained Earnings Accumulated Deficit [Abstract]
Retained earnings - beginning of period	163,470	150,354	157,811	133,820
Retained earnings - end of period	$ 169,893	$ 157,413	$ 169,893	$ 157,413
Weighted Average Number Of Shares Outstanding Basic [Abstract]
Average basic shares outstanding	20,104,000	19,974,000	20,071,000	19,925,000
Weighted Average Number Of Shares Outstanding [Abstract]
Average diluted shares outstanding	20,295,000	20,232,000	20,299,000	20,185,000
Earnings Per Share Basic [Abstract]
Net income	$ 0.36	$ 0.39	$ 0.68	$ 1.26
Earnings Per Share Diluted [Abstract]
Net income	$ 0.36	$ 0.39	$ 0.67	$ 1.25
Dividends	$ (804)	$ (802)	$ (1,608)	$ (1,600)
Common Stock, Dividends, Per Share, Declared	$ 0.04	$ 0.04	$ 0.08	$ 0.08