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Share-Based Compensation: (Details) |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 25, 2013 $ / shares | Mar. 31, 2013 USD ($) | Sep. 30, 2015 USD ($) item $ / shares shares | Sep. 30, 2014 USD ($) $ / shares shares | Sep. 30, 2013 USD ($) $ / shares shares
Share-based compensation |  |  |  |  |
Share-based compensation expense | $ |  |  | $ 447,000 | $ 810,000 | $ 912,000
Income tax effect recognized as a charge to additional paid-in capital related to share-based compensation | $ |  |  | $ (35,000) | $ (253,000) | (33,000)
Number of share-based compensation plans maintained by the company | item |  |  | 3 |  |
Options |  |  |  |  |
Outstanding at the beginning of the period (in shares) |  |  | 687,168 |  |
Outstanding at the end of the period (in shares) |  |  | 645,168 | 687,168 |
Options |  |  |  |  |
Share-based compensation |  |  |  |  |
Reduction in applicable option exercise price of each outstanding option (in dollars per share) | $ / shares | $ 1.50 |  |  |  |
1998 Plan |  |  |  |  |
Share-based compensation |  |  |  |  |
Share-based compensation expense | $ |  |  | $ 0 | $ 0 | $ 34,000
Number of shares of common stock reserved for awards |  |  | 3,389,000 |  |
1998 Plan | Options |  |  |  |  |
Share-based compensation |  |  |  |  |
Unrecognized compensation cost, related to non-vested stock options | $ |  |  | $ 0 |  |
Options |  |  |  |  |
Outstanding at the beginning of the period (in shares) |  |  | 62,000 | 144,500 | 376,200
Granted (in shares) |  |  | 0 | 0 | 0
Exercised (in shares) |  |  |  | (12,000) | (226,800)
Cancelled (in shares) |  |  | (9,000) | (70,500) | (4,900)
Outstanding at the end of the period (in shares) |  |  | 53,000 | 62,000 | 144,500
Vested and expected to vest (in shares) |  |  | 53,000 |  |
Options exercisable at the end of the period (in shares) |  |  | 53,000 |  |
Weighted Average Exercise Price |  |  |  |  |
Outstanding at the beginning of the period (in dollars per share) | $ / shares |  |  | $ 9.91 | $ 12.79 | $ 8.62
Exercised (in dollars per share) | $ / shares |  |  |  | 7.40 |
Cancelled (in dollars per share) | $ / shares |  |  | 16.25 | 16.25 | 11.42
Outstanding at the end of the period (in dollars per share) | $ / shares |  |  | 8.83 | $ 9.91 | $ 12.79
Vested and expected to vest (in dollars per share) | $ / shares |  |  | 8.83 |  |
Options exercisable at the end of the period (in dollars per share) | $ / shares |  |  | 8.83 |  |
Aggregate Intrinsic Value |  |  |  |  |
Exercised (in dollars) | $ |  |  |  | $ 8,604 | $ 174,112
Weighted-average grant date fair value (in dollars per share) | $ / shares |  |  | 0.00 | $ 0.00 | $ 4.63
Intrinsic value of options granted (in dollars per share) | $ / shares |  |  | $ 0 | $ 0 |
2009 Plan |  |  |  |  |
Share-based compensation |  |  |  |  |
Share-based compensation expense | $ |  |  | $ 316,000 | $ 660,000 | $ 678,000
Number of shares of common stock reserved for awards |  |  | 1,200,000 |  |
Number of shares of common stock available for awards under the plan |  |  | 347,755 |  |
2009 Plan | Options |  |  |  |  |
Share-based compensation |  |  |  |  |
Share-based compensation expense | $ |  | $ 22,000 |  |  |
Unrecognized compensation cost, related to non-vested stock options | $ |  | $ 59,000 | $ 68,000 |  |
Options |  |  |  |  |
Outstanding at the beginning of the period (in shares) |  |  | 625,168 | 680,334 | 460,000
Granted (in shares) |  |  |  |  | 250,000
Exercised (in shares) |  |  | (20,000) | (44,666) | (27,999)
Cancelled (in shares) |  |  | (13,000) | (10,500) | (1,667)
Outstanding at the end of the period (in shares) |  |  | 592,168 | 625,168 | 680,334
Vested and expected to vest (in shares) |  |  | 592,168 |  |
Options exercisable at the end of the period (in shares) |  |  | 508,834 |  |
Weighted Average Exercise Price |  |  |  |  |
Outstanding at the beginning of the period (in dollars per share) | $ / shares |  |  | $ 3.28 | $ 3.32 | $ 4.45
Granted (in dollars per share) | $ / shares |  |  |  |  | 4.06
Exercised (in dollars per share) | $ / shares |  |  | 1.95 | 3.78 | 3.78
Cancelled (in dollars per share) | $ / shares |  |  | 2.37 | 3.78 | 3.78
Outstanding at the end of the period (in dollars per share) | $ / shares |  |  | 3.35 | $ 3.28 | $ 3.32
Vested and expected to vest (in dollars per share) | $ / shares |  |  | 3.35 |  |
Options exercisable at the end of the period (in dollars per share) | $ / shares |  |  | $ 3.23 |  |
Aggregate Intrinsic Value |  |  |  |  |
Exercised (in dollars) | $ |  |  | $ 15,200 | $ 178,823 | $ 118,802
Outstanding at the end of the period (in dollars) | $ |  |  |  | $ 3,153,696 |
2009 Plan | Performance-based Award | Employee |  |  |  |  |
Share-based compensation |  |  |  |  |
Maximum award (in shares) |  |  | 300,000 |  |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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