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Stock-based compensation (Details Textual) - USD ($)
1 Months Ended 12 Months Ended
Jun. 30, 2004
Jan. 31, 2002
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation cost     $ 426,705 $ 481,563 $ 756,090
Stock Option Plan 2006 [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Options expiration period     10 years    
Shares reserved for future issuance     670,000    
Fair Value Of options granted     $ 662,350 $ 967,248 1,542,072
Weighted average grant date fair value of options granted       $ 3.76  
Unrecognized option costs     $ 41,726    
Weighted average period of recognition for unrecognized option costs     8 months 12 days    
Stock Option Plan 2006 [Member] | Maximum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based payment award vesting percentage On each anniversary     25.00%    
Options, exercise price as percentage of fair market value     110.00%    
Stock Option Plan 2006 [Member] | Minimum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based payment award vesting percentage On each anniversary     20.00%    
Options, exercise price as percentage of fair market value     50.00%    
Stock Option Plan 2002 [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Options expiration period   10 years      
Shares reserved for future issuance   280,000 12,000    
Share-based payment award vesting percentage On each anniversary   25.00%      
Fair Value Of options granted     $ 56,175 $ 123,585 78,645
Unrecognized option costs     $ 6,718    
Weighted average period of recognition for unrecognized option costs     3 months 22 days    
Stock Option Plan 2002 [Member] | Maximum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Options, exercise price as percentage of fair market value   110.00%      
Stock Option Plan 2002 [Member] | Minimum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Options, exercise price as percentage of fair market value   50.00%      
Stock Option Plan 2004 [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Options expiration period 10 years        
Shares reserved for future issuance 358,000   91,000    
Share-based payment award vesting percentage On each anniversary 25.00%        
Fair Value Of options granted     $ 0 $ 53,126 $ 108,481
Weighted average grant date fair value of options granted     $ 3.02    
Unrecognized option costs     $ 48,012    
Weighted average period of recognition for unrecognized option costs     3 years 1 month 13 days    
Stock Option Plan 2004 [Member] | Maximum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Options, exercise price as percentage of fair market value 110.00%        
Stock Option Plan 2004 [Member] | Minimum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Options, exercise price as percentage of fair market value 50.00%        
Stock Option Plan 2015 [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Options expiration period     10 years    
Shares reserved for future issuance 91,000 12,000 103,000    
Share-based payment award vesting percentage On each anniversary     25.00%    
Weighted average grant date fair value of options granted     $ 3.00    
Unrecognized option costs     $ 103,440    
Weighted average period of recognition for unrecognized option costs     3 years 9 months 18 days    
Stock Option Plan 2015 [Member] | Maximum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Options, exercise price as percentage of fair market value     110.00%    
Stock Option Plan 2015 [Member] | Minimum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Options, exercise price as percentage of fair market value     50.00%