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Note 2 - Summary of Significant Accounting Policies (Details Textual)
€ in Thousands, $ in Thousands
12 Months Ended
Apr. 01, 2015
EUR (€)
Jun. 10, 2005
EUR (€)
Mar. 31, 2016
USD ($)
Mar. 31, 2015
USD ($)
Mar. 31, 2014
USD ($)
Apr. 01, 2015
USD ($)
Jun. 10, 2005
USD ($)
Minimum [Member] | Equipment [Member]              
Property, Plant and Equipment, Useful Life     1 year        
Minimum [Member] | Building and Building Improvements [Member]              
Property, Plant and Equipment, Useful Life     24 years        
Minimum [Member]              
Product Part Numbers     10,000        
Maximum [Member] | Equipment [Member]              
Property, Plant and Equipment, Useful Life     14 years        
Maximum [Member] | Building and Building Improvements [Member]              
Property, Plant and Equipment, Useful Life     50 years        
IKB Deutsche Industrial Bank Loan Payable [Member]              
Debt Instrument, Face Amount   € 10,000         $ 12,200
Debt Instrument, Issuance Date   Jun. 10, 2005          
Debt Instrument, Maturity Date   Jun. 30, 2020          
April 2015 IKB Deutsche Industriebank Loan Payable [Member]              
Debt Instrument, Face Amount € 6,500         $ 7,200  
Debt Instrument, Maturity Date Mar. 31, 2022            
Powersem GmbH [Member]              
Equity Method Investment, Ownership Percentage     45.00%        
EB Tech Ltd [Member]              
Equity Method Investment, Ownership Percentage     20.00%        
ATEC [Member]              
Equity Method Investment, Ownership Percentage       24.30%      
Workforce Subject to Collective Bargaining Arrangements [Member] | Labor Force Concentration Risk [Member] | UNITED KINGDOM              
Concentration Risk, Percentage     54.60%        
Workforce Subject to Collective Bargaining Arrangements [Member] | Labor Force Concentration Risk [Member] | GERMANY              
Concentration Risk, Percentage     94.60%        
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Distributor 1 [Member]              
Concentration Risk, Percentage     12.20% 10.20% 10.80%    
Number of Entity Wide Revenue Major Customers     1 1 1    
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Distributor 2 [Member]              
Concentration Risk, Percentage       10.50%      
Number of Entity Wide Revenue Major Customers       1      
Adjustments for New Accounting Principle, Early Adoption [Member] | Reclassification from Current Deferred Tax Assets to Noncurrent Deferred Tax Assets [Member]              
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification       $ 7,100      
Revenue from Distributors     56.70%        
Allowances for Stock Rotation     $ 1,500 1,700 $ 1,500    
Restricted Cash and Cash Equivalents, Current     $ 277 266      
Gross Profit Margin from Sales of Excess Inventory     100.00%        
Inventory Valuation Reserves, Lower of Cost or Market, Value     $ 409 444      
Income (Loss) from Equity Method Investments     $ (120) (7) 303    
Number of Reporting Units     1        
Advertising Expense     $ 433 $ 437 $ 631    
Percentage of Wafers Manufactured Internally     52.60%        
Percentage of Wafers Manufactured Externally     47.40%