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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Mar. 31, 2018
Summary of Significant Accounting Policies [Abstract] |
Reconciliation of basic and diluted net income per share | The following presents a reconciliation of basic and diluted net income per share.
|  | Years Ended March 31, |
|  | 2018 |  |  | 2017 |  |  | 2016 |
Net income |  | $ | 16,316,000 |  |  | $ | 37,573,000 |  |  | $ | 10,563,000 |
Basic shares |  |  | 18,854,993 |  |  |  | 18,608,812 |  |  |  | 18,233,163 |
Effect of dilutive stock options and warrants |  |  | 659,782 |  |  |  | 809,894 |  |  |  | 832,930 |
Diluted shares |  |  | 19,514,775 |  |  |  | 19,418,706 |  |  |  | 19,066,093 |
Net income per share: |  |  |  |  |  |  |  |  |  |  |  |
Basic net income per share |  | $ | 0.87 |  |  | $ | 2.02 |  |  | $ | 0.58 |
Diluted net income per share |  | $ | 0.84 |  |  | $ | 1.93 |  |  | $ | 0.55 |
Black-Scholes option pricing model assumptions used to derive weighted average fair value of stock options granted | The following summarizes the Black-Scholes option-pricing model assumptions used to derive the weighted average fair value of the stock options granted during the periods noted.
|  | Years Ended March 31, |
|  | 2018 |  |  | 2017 |  |  | 2016 |
Weighted average risk free interest rate |  |  | 1.92 | % |  |  | 1.39 | % |  |  | 1.73 | %
Weighted average expected holding period (years) |  |  | 5.82 |  |  |  | 5.84 |  |  |  | 5.76 |
Weighted average expected volatility |  |  | 47.28 | % |  |  | 47.42 | % |  |  | 46.84 | %
Weighted average expected dividend yield |  |  | - |  |  |  | - |  |  |  | - |
Weighted average fair value of options granted |  | $ | 12.63 |  |  | $ | 13.09 |  |  | $ | 14.14 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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