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Significant Accounting Policies (Tables)
3 Months Ended
Aug. 31, 2014
Accounting Policies [Abstract]  
Schedule of Inventory, Current [Table Text Block]

August 31,

2014

 

May 31,

2014

 

 

 

 

 

 

 

 

Raw materials

$

883,000

 

$

899,000

Work in progress

 

732,000

 

 

635,000

Finished products

 

265,000

 

 

232,000

Total

$

1,880,000

 

$

1,766,000

Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]

 

 

 

Exercise

Price

Weighted

Average

 

 

 

 

Option

Shares

 

 

 

Outstanding May 31, 2014

860,500

 

$

0.51

Exercised

(8,250)

 

$

0.38

Outstanding August 31, 2014

852,250

 

$

0.51

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

 

 

Three Months Ended

August 31,

 

 

2014

 

 

2013

Numerator:

 

 

 

 

 

Loss from continuing operations

$

(219,268)

 

$

(167,714)

 

 

 

 

 

 

Denominator for basic net loss per common share

 

7,547,839

 

 

7,280,866

Effect of dilutive securities:

 

 

 

 

 

Options

 

-

 

 

-

Denominator for diluted net loss per common share

 

7,547,839

 

 

7,280,866

Basic net loss per common share

$

(0.03)

 

$

(0.02)

Diluted net loss per common share

$

(0.03)

 

$

(0.02)