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8. Stock-Based Compensation (Details 1) - Options - $ / shares	3 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Dividend-yield	0.00%	0.00%
Risk-free interest rate	2.00%	3.04%
Expected volatility	88.58%	85.60%
Expected life (years)	6 years 9 months 22 days	6 years 5 months 23 days
Market value per share on grant date	$ .92	$ 1.71
Weighted average fair value per share of common stock	$ .71	$ 1.28

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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