Quarterly Results of Operations (Unaudited) (Details) - USD ($)	3 Months Ended								12 Months Ended
	Mar. 29, 2020	Dec. 29, 2019	Sep. 29, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 30, 2018	Sep. 30, 2018	Jul. 01, 2018	Mar. 29, 2020	Mar. 31, 2019	Apr. 01, 2018
Summarized quarterly financial data
Revenues	$ 128,179,900	$ 139,578,200	$ 141,810,900	$ 130,729,300	$ 144,963,800	$ 152,294,500	$ 158,636,100	$ 150,919,400	$ 540,298,300	$ 606,813,800	$ 580,274,700
Cost of goods sold	111,014,000	116,503,900	115,491,600	105,465,800	116,696,600	121,295,800	127,241,400	120,221,300	448,475,300	485,455,100	460,046,300
Gross profit	17,165,900	23,074,300	26,319,300	25,263,500	28,267,200	30,998,700	31,394,700	30,698,100	91,823,000	121,358,700	120,228,400
Selling, general and administrative expenses	27,493,900	26,479,100	25,745,200	28,096,500	27,280,300	27,494,800	29,477,300	28,961,300	107,814,700	113,213,700	112,326,700
Goodwill impairment	9,108,600	2,569,100							11,677,700
Restructuring charges				488,000					488,000
Operating expenses	36,602,500	29,048,200	25,745,200	28,584,500	27,280,300	27,494,800	29,477,300	28,961,300
(Loss) income from operations	(19,436,600)	(5,973,900)	574,100	(3,321,000)	986,900	3,503,900	1,917,400	1,736,800	(28,157,400)	8,145,000	7,901,700
Interest, net	204,600	367,900	335,100	208,700	186,700	247,900	244,800	174,400	1,116,300	853,800	429,100
(Loss) income before provision for (benefit from) income taxes	(19,641,200)	(6,341,800)	239,000	(3,529,700)	800,200	3,256,000	1,672,600	1,562,400	(29,273,700)	7,291,200	7,472,600
(Benefit from) provision for income taxes	(5,564,500)	(1,320,400)	217,000	(1,036,900)	308,200	551,400	481,800	404,000	(7,704,800)	1,745,400	2,277,200
Net (loss) income	$ (14,076,700)	$ (5,021,400)	$ 22,000	$ (2,492,800)	$ 492,000	$ 2,704,600	$ 1,190,800	$ 1,158,400	$ (21,568,900)	$ 5,545,800	$ 5,195,400
Diluted (loss) earnings per share (in dollars per share)	$ (1.65)	$ (0.59)		$ (0.29)	$ 0.06	$ 0.32	$ 0.14	$ 0.13	$ (2.53)	$ 0.65	$ 0.61
Cash dividends declared per common share (in dollars per share)	$ 0.02	$ 0.20	$ 0.20	$ 0.20	$ 0.20	$ 0.20	$ 0.20	$ 0.20	$ 0.62	$ 0.80	$ 0.80