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Note 2 - Summary of Significant Accounting Policies (Details Textual)
€ in Thousands, $ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Apr. 30, 2015
Dec. 31, 2016
USD ($)
Mar. 31, 2017
USD ($)
Mar. 31, 2016
USD ($)
Mar. 31, 2015
USD ($)
Mar. 31, 2017
EUR (€)
Dec. 12, 2014
Revenue from Distributors     58.70% 56.70% 55.60%    
Allowances for Stock Rotation     $ 1,459 $ 1,494 $ 1,741    
Restricted Cash and Cash Equivalents, Current     $ 1,330 277      
Gross Profit Margin from Sales of Excess Inventory     100.00%        
Product Part Numbers     10,000     10,000  
Inventory Valuation Reserves, Lower of Cost or Market, Value     $ 384 409      
Income (Loss) from Equity Method Investments     809 (120) (7)    
Cost Method Investments     $ 3,100 0      
Number of Reporting Units     1        
Impairment of Intangible Assets, Finite-lived   $ 1,400 $ 1,391    
Advertising Expense     $ 411 433 437    
Percentage of Wafers Manufactured Internally     52.60%     52.60%  
Percentage of Wafers Manufactured Externally     47.40%     47.40%  
Workforce Subject to Collective Bargaining Arrangements [Member] | Labor Force Concentration Risk [Member] | UNITED KINGDOM              
Concentration Risk, Percentage     56.30%        
Workforce Subject to Collective Bargaining Arrangements [Member] | Labor Force Concentration Risk [Member] | GERMANY              
Concentration Risk, Percentage     94.90%        
Powersem GmbH [Member]              
Equity Method Investment, Ownership Percentage     45.00%     45.00%  
EB Tech Ltd [Member]              
Equity Method Investment, Ownership Percentage     20.00%     20.00%  
ATEC [Member]              
Equity Method Investment, Ownership Percentage     24.00%     24.00% 24.00%
Income (Loss) from Equity Method Investments     $ 765 $ (9) $ (140)    
Equipment [Member] | Minimum [Member]              
Property, Plant and Equipment, Useful Life     2 years        
Equipment [Member] | Maximum [Member]              
Property, Plant and Equipment, Useful Life     8 years        
Building and Building Improvements [Member] | Minimum [Member]              
Property, Plant and Equipment, Useful Life     24 years        
Building and Building Improvements [Member] | Maximum [Member]              
Property, Plant and Equipment, Useful Life     50 years        
April 2015 IKB Deutsche Industriebank Loan Payable [Member]              
Security Deposit     $ 1,100     € 1,000  
Security Deposit, Maturity Date Dec. 29, 2017