Annual report pursuant to Section 13 and 15(d)

Income taxes (Details) - Deferred tax assets and liabilities

v2.4.0.8
Income taxes (Details) - Deferred tax assets and liabilities (USD $)
In Thousands, unless otherwise specified
Jul. 31, 2014
Jul. 31, 2013
Deferred tax assets:    
Federal tax carryforward losses $ 35,352 $ 34,836
Provision for uncollectible accounts receivable 753 920
State and local tax carry forward losses 2,604 3,791
Accrued royalties 144 143
Stock compensation 190 317
Depreciation 618 625
Research and development and other tax credit carryforwards 1,085 1,013
Foreign tax carryforward losses 1,207 772
Intangibles 2,970 2,980
Inventory 2,194 1,249
Accrued expenses 3,103 1,622
Other, net 15 19
Deferred tax assets 50,235 48,287
Deferred tax liabilities:    
Deferred patent costs (135) (132)
Prepaid expenses (671) (695)
Unrealized foreign exchange (118)  
Other, net (29) (37)
Deferred tax liabilities (953) (864)
Net deferred tax assets (liabilities) before valuation allowance 49,282 47,423
Less: valuation allowance (49,465) (47,623)
Net deferred tax liabilities $ (183) $ (200)