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Stock Options - Summary of Stock Options Activity (Details) - $ / shares
12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Share-based Payment Arrangement [Abstract]    
Number of Shares Outstanding, Beginning Balance 148,600 149,600
Number of Shares Outstanding, Granted 40,000
Number of Shares Outstanding, Exercised 2,900
Number of Shares Outstanding, Forfeited or Expired (1,000)
Number of Shares Outstanding, Ending Balance 185,700 148,600
Number of Shares Outstanding, Vested 145,700  
Number of Shares Outstanding, Exercisable 145,700  
Weighted Average Exercise Price, Beginning Balance $ 4.84 $ 6.54
Weighted Average Exercise Price, Granted
Weighted Average Exercise Price, Exercised 8.56
Weighted Average Exercise Price, Forfeited or Expired 5.98
Weighted Average Exercise Price, Ending Balance 6.18 $ 4.84
Weighted Average Exercise Price, Vested 6.55  
Weighted Average Exercise Price, Exercisable $ 6.55  
Weighted Average Remaining Contract Life in Years, Beginning Balance 4 years 4 months 2 days 5 years 4 months 2 days
Weighted Average Remaining Contract Life in Years, Ending Balance 4 years 8 months 5 days 4 years 4 months 2 days
Weighted Average Remaining Contract Life in Years, Vested 3 years 4 months 13 days  
Weighted Average Remaining Contract Life in Years, Exercisable 3 years 4 months 13 days