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Net earnings per share (Tables)
12 Months Ended
Mar. 31, 2019
Accounting Policies [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted
   Year Ended March 31,
   2017  2018  2019
          
Income / (loss) available to common stockholders ($ in thousands)  $2,795   $4   $(463)
                
Basic weighted average common shares outstanding   5,143,648    4,910,357    4,703,224 
                
Basic net earnings / (loss) per share  $0.54   $0.00   $(0.10)
                
                
Basic weighted average common shares outstanding   5,143,648    4,910,357    4,703,224 
Effect of dilutive securities – Options   172,745    380,547    —   
                
Diluted weighted average common and potential common shares outstanding   5,316,393    5,290,904    4,703,224 
                
Diluted net earnings / (loss) per share  $0.53   $0.00   $(0.10)