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Net earnings per share (Tables)
12 Months Ended
Mar. 31, 2018
Accounting Policies [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted
    Year Ended March 31,  
    2016     2017     2018  
                   
Income available to common stockholders ($ in thousands)   $ 2,871     $ 2,795     $ 4  
                         
Basic weighted average common shares outstanding     5,173,431       5,143,648       4,910,357  
                         
Basic net earnings per share   $ 0.55     $ 0.54     $ 0.00  
                         
                         
Basic weighted average common shares outstanding     5,173,431       5,143,648       4,910,357  
Effect of dilutive securities – Options     -       172,745       380,547  
                         
Diluted weighted average common and potential common shares outstanding     5,173,431       5,316,393       5,290,904  
                         
Diluted net earnings income per share   $ 0.55     $ 0.53     $ 0.00