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Stock Options, Restricted Shares and Warrants (Details Textual) - USD ($)
1 Months Ended 12 Months Ended
May 31, 2013
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting term for restricted shares   2 years 7 months    
Grant of shares to non-employees and consultants (shares)   2,500    
Common stock closing price (usd per share)   $ 1.39    
Value of shares issued to consultants (usd per share)   $ 2.00    
Compensation expense   $ 1,462,000 $ 1,499,000 $ 1,593,000
Warrants exercised (shares)     38,980 0
Warrants exercised (usd per share)     $ 2.25 $ 0.00
Restricted shares        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Alternate vesting term for restricted shares 1 year      
Restricted shares granted (shares)   795,805 410,496 526,663
Compensation expense   $ 1,306,191    
Weighted average grant-date fair value (usd per share)   $ 2.06    
Restricted shares | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting term for restricted shares 3 years      
Per share price on grant date (USD per share)   1.34 $ 4.16 $ 2.41
Weighted average grant-date fair value (usd per share)   1.34    
Restricted shares | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting term for restricted shares 5 years      
Per share price on grant date (USD per share)   2.62 $ 7.23 $ 6.97
Weighted average grant-date fair value (usd per share)   $ 2.62    
2003 Stock Option and 2004 Stock and Incentive Awards Plans        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Reserved shares for issuance to key employees (shares)   13,500,000    
Maximum life of option under the plan   10 years    
2003 Stock Option and 2004 Stock and Incentive Awards Plans | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period   1 month    
2003 Stock Option and 2004 Stock and Incentive Awards Plans | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period   5 years    
2004 Stock and Incentive Awards Plan | Non-Employee Director        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Grant of shares to non-employees and consultants (shares)   35,290 27,931 33,641
2004 Stock and Incentive Awards Plan | Non-Employee Director | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Common stock closing price (usd per share)   $ 1.20 $ 4.20 $ 2.41
2004 Stock and Incentive Awards Plan | Non-Employee Director | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Common stock closing price (usd per share)   $ 2.62 $ 5.23 $ 5.73
Harris        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expense       $ 200,000