Quarterly Results of Operations (Unaudited) (Details) - USD ($)	3 Months Ended								12 Months Ended
	Mar. 27, 2016	Dec. 27, 2015	Sep. 27, 2015	Jun. 28, 2015	Mar. 29, 2015	Dec. 28, 2014	Sep. 28, 2014	Jun. 29, 2014	Mar. 27, 2016	Mar. 29, 2015	Mar. 30, 2014
Summarized quarterly financial data
Revenues	$ 114,154,100	$ 139,510,700	$ 142,353,300	$ 134,664,000	$ 112,962,200	$ 135,188,700	$ 148,521,800	$ 152,946,300	$ 530,682,100	$ 549,619,000	$ 560,086,600
Cost of goods sold	91,135,200	110,057,300	111,841,600	105,682,100	88,650,400	106,367,800	116,160,800	120,801,500	418,716,200	431,980,500	433,728,700
Gross profit	23,018,900	29,453,400	30,511,700	28,981,900	24,311,800	28,820,900	32,361,000	32,144,800	111,965,900	117,638,500	126,357,900
Selling, general and administrative expenses	26,202,100	24,742,400	25,865,400	26,122,400	23,983,100	26,136,800	26,494,400	26,072,400	102,932,300	102,686,700	99,868,000
Restructuring charges					573,400					573,400
Operating expenses	26,202,100	24,742,400	25,865,400	26,122,400	24,556,500	26,136,800	26,494,400	26,072,400
Income from operations	(3,183,200)	4,711,000	4,646,300	2,859,500	(244,700)	2,684,100	5,866,600	6,072,400	9,033,600	14,378,400	26,489,900
Interest, net	12,400	55,500	47,100	46,300	28,200	61,300	49,400	28,400	161,300	167,300	177,700
Income before provision for income taxes	(3,195,600)	4,655,500	4,599,200	2,813,200	(272,900)	2,622,800	5,817,200	6,044,000	8,872,300	14,211,100	26,312,200
Provision for income taxes	(1,205,800)	1,768,800	1,850,900	1,117,900	(41,000)	941,600	2,303,600	2,372,600	3,531,800	5,576,800	10,063,100
Net income	$ (1,989,800)	$ 2,886,700	$ 2,748,300	$ 1,695,300	$ (231,900)	$ 1,681,200	$ 3,513,600	$ 3,671,400	$ 5,340,500	$ 8,634,300	$ 16,249,100
Diluted (loss) earnings per share (in dollars per share)	$ (0.24)	$ 0.35	$ 0.33	$ 0.20	$ (0.03)	$ 0.20	$ 0.42	$ 0.44	$ 0.65	$ 1.04	$ 1.94
Cash dividends declared per common share (in dollars per share)	$ 0.20	$ 0.20	$ 0.20	$ 0.20	$ 0.20	$ 0.20	$ 0.20	$ 0.20	$ 0.80	$ 0.80	$ 0.74