UNAUDITED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Net sales
Total	$ 355,031	$ 381,372
Cost of sales
Total	256,474	288,733
Gross profit	98,557	92,639
Selling, general, and administrative	69,467	65,787
Depreciation and amortization	3,516	3,463
Interest and financing costs	577	628
Operating expenses	73,560	69,878
Operating income	24,997	22,761
Other income (expense)	98	(45)
Earnings before tax	25,095	22,716
Provision for income taxes	7,735	6,528
Net earnings	$ 17,360	$ 16,188
Net earnings per common share-basic (in dollars per share)	$ 1.30	$ 1.21
Net earnings per common share-diluted (in dollars per share)	$ 1.30	$ 1.20
Weighted average common shares outstanding-basic (in shares)	13,322	13,356
Weighted average common shares outstanding-diluted (in shares)	13,388	13,457
Product [Member]
Net sales
Total	$ 307,240	$ 335,601
Cost of sales
Total	226,634	260,063
Services [Member]
Net sales
Total	47,791	45,771
Cost of sales
Total	$ 29,840	$ 28,670