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Discontinued operations
 3 Months Ended
Jan. 31, 2015
Discontinued Operations and Disposal Groups [Abstract]  
Discontinued operations
Note 3 - Discontinued operations
 
During 2013, the Company sold its RF Neulink and RadioMobile divisions, which together had comprised the Company’s RF Wireless segment. The divisions were sold pursuant to asset purchase agreements, whereby no purchase price was paid at the closing. Rather, the agreements stipulated royalty payments from each of the purchasers over a three year period. For the three months ended January 31, 2015, the Company recognized approximately $19,000 and $2,000 of royalty income for the RF Neulink and RadioMobile divisions, respectively, which amounts have been included within discontinued operations. For the three months ended January 31, 2014, the Company recognized approximately $4,000 and $4,000 of royalty income for the RF Neulink and RadioMobile divisions, respectively, which amounts have been included within discontinued operations.