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Concentration of Credit Risk	6 Months Ended
Concentration of Credit Risk	Sep. 30, 2018
Risks And Uncertainties [Abstract]
Concentration of Credit Risk	13. Concentration of Credit Risk We had cash deposits at United States banks and financial institutions which exceeded federally insured limits at September 30, 2018. We are exposed to credit loss for amounts in excess of insured limits in the event of non-performance by the institutions; however, we do not anticipate non-performance by these institutions.