Earnings Per Share (Details) - USD ($)	3 Months Ended								12 Months Ended
	Mar. 31, 2019	Dec. 30, 2018	Sep. 30, 2018	Jul. 01, 2018	Apr. 01, 2018	Dec. 24, 2017	Sep. 24, 2017	Jun. 25, 2017	Mar. 31, 2019	Apr. 01, 2018	Mar. 26, 2017
Earnings per share - Basic
Net earnings	$ 492,000	$ 2,704,600	$ 1,190,800	$ 1,158,400	$ 1,168,400	$ 1,570,200	$ 1,773,900	$ 682,900	$ 5,545,800	$ 5,195,400	$ 1,445,100
Earnings available to common shareholders - Basic									$ 5,546,000	$ 5,195,000	$ 1,445,000
Weighted average common shares outstanding - Basic (in shares)									8,436,796	8,370,742	8,312,731
Basic earnings per share (in dollars per share)									$ 0.66	$ 0.62	$ 0.17
Earnings per share - Diluted
Net earnings	$ 492,000	$ 2,704,600	$ 1,190,800	$ 1,158,400	$ 1,168,400	$ 1,570,200	$ 1,773,900	$ 682,900	$ 5,545,800	$ 5,195,400	$ 1,445,100
Earnings available to common shareholders – Diluted									$ 5,546,000	$ 5,195,000	$ 1,445,000
Weighted average common shares outstanding - Basic (in shares)									8,436,796	8,370,742	8,312,731
Effect of dilutive options (in shares)									130,163	100,263	27,686
Diluted weighted-average common shares outstanding (in shares)									8,566,959	8,471,005	8,340,417
Diluted earnings per share (in dollars per share)	$ 0.06	$ 0.32	$ 0.14	$ 0.13	$ 0.14	$ 0.19	$ 0.21	$ 0.08	$ 0.65	$ 0.61	$ 0.17
Anti-dilutive equity awards (in shares)									94,000	40,000	60,000
Stock Options
Earnings per share - Diluted
Anti-dilutive equity awards (in shares)									94,000	40,000	60,000
Options outstanding (in shares)	591,500				540,000				591,500	540,000	420,000
Performance Stock Units
Earnings per share - Diluted
Anti-dilutive equity awards (in shares)									0	0	0