Consolidated Balance Sheets (Parenthetical) - USD ($)	Mar. 31, 2019	Apr. 01, 2018
Current assets:
Trade accounts receivable, allowance for doubtful accounts	$ 2,137,900	$ 1,094,900
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)	14,190,027	14,111,703
Common stock, outstanding (in shares)	8,468,529	8,396,537
Treasury stock (in shares)	5,721,498	5,715,166