Consolidated Balance Sheets (Parenthetical) (USD $)	Apr. 30, 2012	Apr. 30, 2011
Consolidated Balance Sheets [Abstract]
Allowance for doubtful accounts	$ 164,103	$ 150,000
Customer relationships, net of amortization	$ 2,683,075	$ 2,570,325
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	500,000	500,000
Preferred stock, shares issued
Preferred stock, shares outstanding
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	12,000,000	12,000,000
Common stock, shares issued	3,909,572	3,864,274
Common stock, shares outstanding	3,909,572	3,864,274