Annual report pursuant to Section 13 and 15(d)

Income taxes (Details) - Deferred tax assets and liabilities

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Income taxes (Details) - Deferred tax assets and liabilities - USD ($)
$ in Thousands
Jul. 31, 2015
Jul. 31, 2014
Deferred tax assets:    
Federal tax carryforward losses $ 35,411 $ 35,352
Provision for uncollectible accounts receivable 685 753
State and local tax carry forward losses 2,661 2,604
Accrued royalties 144 144
Stock compensation 99 190
Depreciation 618 618
Research and development and other tax credit carryforwards 1,134 1,085
Foreign tax carryforward losses 1,476 1,207
Intangibles 2,951 2,970
Inventory 2,558 2,194
Accrued expenses 2,627 3,103
Unrealized foreign exchange 98  
Other, net 18 15
Deferred tax assets 50,480 50,235
Deferred tax liabilities:    
Deferred patent costs (152) (135)
Prepaid expenses (676) (671)
Unrealized foreign exchange   (118)
Other, net (31) (29)
Deferred tax liabilities (859) (953)
Net deferred tax assets (liabilities) before valuation allowance 49,621 49,282
Less: valuation allowance (49,658) (49,465)
Net deferred tax liabilities $ (37) $ (183)