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Income Taxes (Details Narrative) - USD ($)
$ in Thousands
 12 Months Ended
Apr. 30, 2020
Apr. 30, 2019
Income tax benefits $ (895) $ (850)
Deferred tax assets, valuation allowance 42,431 41,708
Increase (decrease) in valuation allowance 700 (2,500)
Net operating loss carry forwards $ 160,700 152,500
Operating loss carryforwards, expiration description Begin to expire in fiscal 2021  
Net operating loss subject to no expiration $ 22,600  
Operating loss carryforwards, deductibility limitation The deductibility of such federal net operating losses may be limited to 80% of our taxable income in future years.  
Deferred tax assets, tax credit carryforwards, research and development $ 3,076 3,315
Operating loss carryforwards, limitation on use The Company's annual Section 382 limitation is approximately $3.3 million. The Section 382 limitation is cumulative from year to year, and thus, to the extent net operating loss or other credit carry forwards are not utilized up to the amount of the available annual limitation, the limitation is carried forward and added to the following year's available limitation. Such limitation only applies to net operating losses incurred in periods prior to the ownership change. The Company has not performed additional analysis on ownership changes that may have occurred subsequently to further limit the ability to utilize net tax attributes.  
Proceed from sale of loss carryforwards and tax credits $ 10,000 9,100
Income tax description Net operating loss and credit carry forwards since inception remain open to examination by taxing authorities and will continue to remain open for a period of time after utilization.  
Uncertain tax positions  
Spain [Member]    
Income tax description The Company is currently undergoing an income tax audit in Spain for the period from 2011 to 2014  
Uncertain tax positions
Interest or penalties accrued on uncertain tax positions  
State and Local Jurisdiction [Member]    
Net operating loss carry forwards $ 22,500 $ 23,300
Operating loss carryforwards, expiration description Begin to expire in 2039, which also may be limited to utilization limitations. Begin to expire in 2039, which also may be limited to utilization limitations.
Foreign [Member]    
Net operating loss carry forwards $ 16,300 $ 16,900