Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)	Oct. 31, 2015	Apr. 30, 2015
Statement of Financial Position [Abstract]
Allowance for doubtful accounts and sales returns	$ 130,000	$ 140,000
Accumulated depreciation and amortization	$ 1,014,831	$ 966,831
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, authorized shares	1,300,000	1,300,000
Preferred stock, outstanding shares	544,600	626,600
Common stock, par value	$ 1	$ 1
Common stock, authorized shares	54,000,000	54,000,000
Common stock, issued shares	3,925,870	2,776,012
Common stock, outstanding shares	3,925,870	2,776,012