Consolidated Balance Sheets (Parenthetical) - USD ($)	Dec. 24, 2017	Mar. 26, 2017
Current assets:
Trade accounts receivable, allowance for doubtful accounts	$ 913,800	$ 782,200
Shareholders' equity:
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, authorized (in shares)	500,000	500,000
Preferred stock, issued (in shares)	0	0
Preferred stock, outstanding (in shares)	0	0
Common stock, par value (in dollars shares)	$ 0.01	$ 0.01
Common stock, authorized (in shares)	15,000,000	15,000,000
Common stock, issued (in shares)	14,098,689	14,048,392
Common stock, outstanding (in shares)	8,383,523	8,337,669
Treasury stock (in shares)	5,715,166	5,710,723