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Equity and Stock-Based Compensation (Tables) | 12 Months Ended
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Sep. 30, 2021
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Summary of Equity Compensation Plans | Equity compensation plans as of September 30, 2021 are summarized in the table below:
Name of Plan |  | Shares Authorized |  |  | Shares Available for Grant |  |  | Options Outstanding |  |  | Plan Expiration
2007 Plan |  |  | 3,000,000 |  |  |  | 929,820 |  |  |  | 464,269 |  |  | Mar. 2024
Non-Employee Directors Stock Option Plan |  |  | 500,000 |  |  |  | 84,934 |  |  |  | 144,000 |  |  | Mar. 2024
|  |  |  |  |  | 1,014,754 |  |  |  | 608,269 |  |  |
Schedule of Fair Value of Stock Option Using Black-Scholes Option Pricing Model | We estimated the fair value of stock option awards on the date of grant using the Black-Scholes option pricing model using the following assumptions:
|  | Years Ended September 30,
|  | 2021 |  | 2020 |  | 2019
Risk free interest rate |  | 1% |  | 1% |  | 3%
Expected life |  | 6 years |  | 6 years |  | 6 years
Dividend rate |  | 0% |  | 0% |  | 0%
Volatility |  | 58% |  | 58% |  | 60%
Summary of Stock Option Activity | :
|  | Years Ended September 30, |
|  | 2021 |  |  | 2020 |  |  | 2019 |
|  | Options |  |  | Weighted Average Exercise Price |  |  | Options |  |  | Weighted Average Exercise Price |  |  | Options |  |  | Weighted Average Exercise Price |
Outstanding at beginning of period |  |  | 696,665 |  |  | $ | 7.00 |  |  |  | 1,068,665 |  |  | $ | 7.04 |  |  |  | 1,248,758 |  |  | $ | 7.69 |
Granted |  |  | 204,000 |  |  |  | 6.25 |  |  |  | 32,500 |  |  |  | 5.34 |  |  |  | 198,850 |  |  |  | 5.35 |
Exercised |  |  | (241,320 | ) |  |  | 6.40 |  |  |  | (160,375 | ) |  |  | 5.47 |  |  |  | (52,201 | ) |  |  | 4.02 |
Forfeited/expired |  |  | (51,076 | ) |  |  | 13.01 |  |  |  | (244,125 | ) |  |  | 7.94 |  |  |  | (326,742 | ) |  |  | 9.00 |
Outstanding at end of period |  |  | 608,269 |  |  | $ | 6.48 |  |  |  | 696,665 |  |  | $ | 7.00 |  |  |  | 1,068,665 |  |  | $ | 7.04 |
Exercisable at end of period |  |  | 403,853 |  |  | $ | 6.87 |  |  |  | 611,542 |  |  | $ | 7.19 |  |  |  | 842,083 |  |  | $ | 7.45 |
Weighted average grant-date fair value of options granted during the period |  | $ | 3.33 |  |  |  |  |  | $ | 2.89 |  |  |  |  |  | $ | 3.08 |  |  |  |
Summary of Stock Options Outstanding and Exercisable | The following table summarizes information for stock options outstanding and exercisable as of September 30, 2021:
|  | Options Outstanding |  |  | Options Exercisable |
Range of Exercise Prices |  | Number Outstanding |  |  | Remaining Contractual Life (in years) |  |  | Weighted Average Exercise Price Per Share |  |  | Number Exercisable |  |  | Weighted Average Exercise Price Per Share |
2.95-4.90 |  |  | 77,750 |  |  |  | 6.59 |  |  | $ | 4.63 |  |  |  | 71,084 |  |  | $ | 4.61 |
5.07-5.07 |  |  | 2,800 |  |  |  | 5.13 |  |  |  | 5.07 |  |  |  | 2,800 |  |  |  | 5.07 |
5.25-5.25 |  |  | 69,175 |  |  |  | 4.09 |  |  |  | 5.25 |  |  |  | 69,175 |  |  |  | 5.25 |
5.26-5.52 |  |  | 88,375 |  |  |  | 7.56 |  |  |  | 5.43 |  |  |  | 42,375 |  |  |  | 5.50 |
5.67-5.67 |  |  | 141,500 |  |  |  | 9.13 |  |  |  | 5.67 |  |  |  | — |  |  |  | — |
5.75-7.01 |  |  | 83,250 |  |  |  | 3.46 |  |  |  | 6.70 |  |  |  | 79,000 |  |  |  | 6.70 |
7.40-7.98 |  |  | 47,919 |  |  |  | 5.28 |  |  |  | 7.51 |  |  |  | 47,919 |  |  |  | 7.51 |
9.98-9.98 |  |  | 67,500 |  |  |  | 3.14 |  |  |  | 9.98 |  |  |  | 67,500 |  |  |  | 9.98 |
9.99-10.71 |  |  | 12,000 |  |  |  | 6.70 |  |  |  | 10.35 |  |  |  | 6,000 |  |  |  | 10.71 |
11.51-11.51 |  |  | 18,000 |  |  |  | 9.48 |  |  |  | 11.51 |  |  |  | 18,000 |  |  |  | 11.51 |
|  |  | 608,269 |  |  |  | 6.20 |  |  | $ | 6.48 |  |  |  | 403,853 |  |  | $ | 6.87 |

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- Definition Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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