Earnings Per Share And Stockholders' Equity (Narrative) (Details) - USD ($)		3 Months Ended		6 Months Ended
	Oct. 01, 2016	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2017	Oct. 31, 2016
Earnings Per Share And Stockholders' Equity [Line Items]
Common stock shares were outstanding		359,763	366,763	359,763	366,763
Options granted				0	0
Stock option expense		$ 0	$ 82,731	$ 83,659	$ 166,404
Balance of unrecognized compensation expense related to stock options plans		$ 0	$ 246,479	$ 0	246,479
Restricted stock expense					$ 10,274
Anti-dilutive common stock outstanding excluded from the calculation of diluted earnings per share		0	35,067	0	29,500
ESPP compensation expense		$ 0	$ 1,677	$ 0	$ 3,559
Stockholders' equity relating to purchases under the ESPP		$ 0	1,472	$ 0	8,347
Employee Stock Purchase Plan [Member]
Earnings Per Share And Stockholders' Equity [Line Items]
Shares of common stock for issuance		500,000		500,000
Additional shares of common stock for issuance each fiscal year				25,000
ESPP termination date				Aug. 15, 2016
ESPP final purchase date				Aug. 31, 2016
Restricted Stock [Member] | 2013 Non-Employee Director Restricted Stock Plan [Member]
Earnings Per Share And Stockholders' Equity [Line Items]
Shares of restricted stock granted	11,250
Restricted stock, fully vest date	Apr. 01, 2017
Restricted stock expense		$ 0	$ 10,274	$ 0	$ 10,274