CONSOLIDATED BALANCE SHEETS (UNAUDITED) (Parenthetical) - $ / shares	Jul. 30, 2017	Apr. 30, 2017	[1]	Jul. 31, 2016
Statement of Financial Position [Abstract]
Preferred stock, par value	$ 0.05	$ 0.05		$ 0.05
Preferred stock, authorized shares	10,000,000	10,000,000		10,000,000
Common stock, par value	$ 0.05	$ 0.05		$ 0.05
Common stock, authorized shares	40,000,000	40,000,000		40,000,000
Common stock, issued	12,441,161	12,356,631		12,306,956
Common stock, outstanding	12,441,161	12,356,631		12,306,956

[1] Derived from audited financial statements.