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Earnings per Share (Tables)
 9 Months Ended
Jan. 31, 2013
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic, by Common Class, Including Two Class Method [Table Text Block]
 
Three Months Ended
 
Nine Months Ended
 
January 31,
2013
January 31,
2012
 
January 31,
2013
January 31,
2012
Net earnings (loss)
$
66,000

$
30,000

 
$
447,000

$
(101,000
)
Amounts allocated to participating securities (nonvested restricted shares)
(3,000
)
(1,000
)
 
(20,000
)
—

Net income (loss) attributable to common shareholders 
$
63,000

$
29,000

 
$
427,000

$
(101,000
)
Basic weighted average common shares
5,265,750

5,034,288

 
5,265,750

5,189,158

Earnings (loss) per share attributable to common shareholders:
 

 
 
 



Basic earnings (loss) per share
$
0.01

$
0.01

 
$
0.08

$
(0.02
)