Consolidated Statements of Changes in Shareholders' Equity - USD ($)	Common Stock	Additional Paid-in Capital	Treasury Stock	Retained Earnings	Total
Balance at Mar. 29, 2020	$ 101,400	$ 65,318,500	$ (58,496,200)	$ 76,779,000	$ 83,702,700
Balance (in shares) at Mar. 29, 2020	8,577,549
Increase (Decrease) in Stockholders' Equity
Issuance of common stock for 401k match	$ 200	132,500			132,700
Issuance of common stock for 401k match (in shares)	23,676
Treasury stock purchases			(58,800)		(58,800)
Treasury stock purchases (in shares)	(12,781)
Non-cash stock compensation expense	$ 600	311,300			311,900
Non-cash stock compensation expense (in shares)	48,685
Net income (loss)				(4,631,400)	(4,631,400)
Balance at Jun. 28, 2020	$ 102,200	65,762,300	(58,555,000)	72,147,600	79,457,100
Balance (in shares) at Jun. 28, 2020	8,637,129
Balance at Mar. 29, 2020	$ 101,400	65,318,500	(58,496,200)	76,779,000	83,702,700
Balance (in shares) at Mar. 29, 2020	8,577,549
Increase (Decrease) in Stockholders' Equity
Net income (loss)					(5,812,700)
Balance at Dec. 27, 2020	$ 103,300	66,765,600	(62,800)	12,411,300	79,217,400
Balance (in shares) at Dec. 27, 2020	8,740,670
Balance at Jun. 28, 2020	$ 102,200	65,762,300	(58,555,000)	72,147,600	79,457,100
Balance (in shares) at Jun. 28, 2020	8,637,129
Increase (Decrease) in Stockholders' Equity
Issuance of common stock for 401k match	$ 200	117,400			117,600
Issuance of common stock for 401k match (in shares)	24,552
Proceeds from issuance of stock	$ 200	107,100			107,300
Proceeds from issuance of stock (in shares)	23,240
Treasury stock purchases			(14,100)		(14,100)
Treasury stock purchases (in shares)	(2,250)
Non-cash stock compensation expense	$ 100	316,600			316,700
Non-cash stock compensation expense (in shares)	7,500
Retirement of treasury stock			58,555,000	(58,555,000)
Net income (loss)				(266,900)	(266,900)
Balance at Sep. 27, 2020	$ 102,700	66,303,400	(14,100)	13,325,700	79,717,700
Balance (in shares) at Sep. 27, 2020	8,690,171
Increase (Decrease) in Stockholders' Equity
Issuance of common stock for 401k match	$ 200	131,600			131,800
Issuance of common stock for 401k match (in shares)	23,081
Treasury stock purchases			(48,700)		(48,700)
Treasury stock purchases (in shares)	(8,000)
Non-cash stock compensation expense	$ 400	330,600			331,000
Non-cash stock compensation expense (in shares)	35,418
Net income (loss)				(914,400)	(914,400)
Balance at Dec. 27, 2020	$ 103,300	66,765,600	(62,800)	12,411,300	79,217,400
Balance (in shares) at Dec. 27, 2020	8,740,670
Balance at Mar. 28, 2021	$ 104,200	67,227,700	(62,800)	9,481,100	$ 76,750,200
Balance (in shares) at Mar. 28, 2021	8,833,833				8,833,833
Increase (Decrease) in Stockholders' Equity
Issuance of common stock for 401k match	$ 100	102,700			$ 102,800
Issuance of common stock for 401k match (in shares)	13,782
Treasury stock purchases			(28,900)		(28,900)
Treasury stock purchases (in shares)	(3,960)
Non-cash stock compensation expense	$ 500	254,400			254,900
Non-cash stock compensation expense (in shares)	39,182
Exercise of stock options (in dollars)		10,900	(13,300)		(2,400)
Exercise of stock options (in shares)	1,754
Net income (loss)				(1,717,300)	(1,717,300)
Balance at Jun. 27, 2021	$ 104,800	67,595,700	(105,000)	7,763,800	75,359,300
Balance (in shares) at Jun. 27, 2021	8,884,591
Balance at Mar. 28, 2021	$ 104,200	67,227,700	(62,800)	9,481,100	$ 76,750,200
Balance (in shares) at Mar. 28, 2021	8,833,833				8,833,833
Increase (Decrease) in Stockholders' Equity
Net income (loss)					$ (1,085,200)
Balance at Dec. 26, 2021	$ 105,600	68,369,700	(129,200)	8,395,900	$ 76,742,000
Balance (in shares) at Dec. 26, 2021	8,962,932				8,962,932
Balance at Jun. 27, 2021	$ 104,800	67,595,700	(105,000)	7,763,800	$ 75,359,300
Balance (in shares) at Jun. 27, 2021	8,884,591
Increase (Decrease) in Stockholders' Equity
Issuance of common stock for 401k match	$ 200	110,400			110,600
Issuance of common stock for 401k match (in shares)	16,419
Treasury stock purchases			(24,200)		(24,200)
Treasury stock purchases (in shares)	(4,244)
Non-cash stock compensation expense	$ 300	367,800			368,100
Non-cash stock compensation expense (in shares)	29,959
Net income (loss)				(826,700)	(826,700)
Balance at Sep. 26, 2021	$ 105,300	68,073,900	(129,200)	6,937,100	74,987,100
Balance (in shares) at Sep. 26, 2021	8,926,725
Increase (Decrease) in Stockholders' Equity
Issuance of common stock for 401k match	$ 200	113,200			113,400
Issuance of common stock for 401k match (in shares)	20,554
Proceeds from issuance of stock	$ 100	80,900			81,000
Proceeds from issuance of stock (in shares)	15,653
Non-cash stock compensation expense		101,700			101,700
Net income (loss)				1,458,800	1,458,800
Balance at Dec. 26, 2021	$ 105,600	$ 68,369,700	$ (129,200)	$ 8,395,900	$ 76,742,000
Balance (in shares) at Dec. 26, 2021	8,962,932				8,962,932