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Shareholders' Equity - Narrative (Details) |  |  |  |  | 1 Months Ended | 12 Months Ended | 105 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 14, 2020 | Feb. 25, 2020 USD ($) | Feb. 20, 2020 $ / shares shares | Jun. 24, 2016 USD ($) shares | Aug. 31, 2020 holder shares | Sep. 30, 2020 USD ($) day vote $ / shares shares | Sep. 30, 2019 USD ($) $ / shares shares | Sep. 30, 2018 USD ($) | Sep. 30, 2020 USD ($) vote $ / shares shares | Dec. 20, 2011 USD ($)
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |
Number of voting rights per share, common stock | vote |  |  |  |  |  | 1 |  |  | 1 |
Preferred stock, shares authorized | shares |  |  |  |  |  | 10,000,000 | 10,000,000 |  | 10,000,000 |
Preferred stock, par value (in dollars per share) |  |  |  |  |  | $ 0.0001 | $ 0.0001 |  | $ 0.0001 |
Preferred stock, shares issued | shares |  |  |  |  |  | 700,000 | 700,000 |  | 700,000 |
Stock issuance costs | $ |  |  |  | $ 1,200,000 |  |  |  |  |  |
Preferred stock cash dividends declared | $ |  |  |  |  |  | $ 5,264,000 | $ 5,250,000 | $ 5,250,000 |  |
Preferred stock, liquidation preference (in dollars per share) |  |  |  |  |  | $ 100 | $ 100 |  | $ 100 |
Affiliated Holders | holder |  |  |  |  | 6 |  |  |  |  |
Unaffiliated Holders | holder |  |  |  |  | 12 |  |  |  |  |
Affiliated holder, conversion cap | 180 days |  |  |  |  |  |  |  |  |
Volume weighted average price, conversion rate if exceeded |  |  |  |  |  | 2.5 |  |  | 2.5 |
Conversion Trigger | day |  |  |  |  |  | 20 |  |  |  |
Conversion Cap |  |  |  |  |  | 120 days |  |  |  |
Notice of conversion |  |  |  |  |  | 10 days |  |  |  |
Common stock, par value (in dollars per share) |  |  |  |  |  | $ 0.0001 | $ 0.0001 |  | $ 0.0001 |
Net proceeds from the Offering | $ |  | $ 49,200,000 |  |  |  |  |  |  |  |
Repurchase of common stock authorized by Board of Directors | $ |  |  |  |  |  |  |  |  |  | $ 25,000,000.0
Purchased shares (in shares) | shares |  |  |  |  |  |  |  |  | 1,677,570 |
Average price per share |  |  |  |  |  |  |  |  | $ 9.09 |
Aggregate cost of treasury stock repurchased during the period | $ |  |  |  |  |  |  |  |  | $ 15,300,000 |
Preferred Stock Including Additional Paid in Capital |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from sale | $ |  |  |  | $ 70,000,000.0 |  |  |  |  |  |
Public Offering |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate shares sold (in shares) | shares |  |  | 6,782,610 |  |  |  |  |  |  |
Common stock, par value (in dollars per share) |  |  | $ 0.0001 |  |  |  |  |  |  |
Sale of stock (in dollars per share) |  |  | $ 7.75 |  |  |  |  |  |  |
Direct costs | $ |  |  |  |  |  | $ 400,000 |  |  |  |
Treasury stock (in shares) | shares |  |  | 82,287 |  |  |  |  |  |  |
Over-Allotment Option |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate shares sold (in shares) | shares |  |  | 1,017,390 |  |  |  |  |  |  |
Option to purchase additional shares, period |  |  | 30 days |  |  |  |  |  |  |
Minimum |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |
Special cash dividend rate |  |  |  |  |  | 1.5 |  |  | 1.5 |
Maximum |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |
Special cash dividend rate |  |  |  |  |  | 2.0 |  |  | 2.0 |
Series A Preferred Stock |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |
Preferred stock, shares authorized | shares |  |  |  |  |  | 10,000,000 |  |  | 10,000,000 |
Preferred stock, par value (in dollars per share) |  |  |  |  |  | $ 0.0001 |  |  | $ 0.0001 |
Preferred stock, shares issued | shares |  |  |  | 700,000 |  | 700,000 | 700,000 |  | 700,000 |
Preferred stock rate |  |  |  |  |  | 7.50% |  |  |  |
Accrued dividend rate |  |  |  |  |  | 2.00% |  |  |  |
Preferred stock, liquidation preference (in dollars per share) |  |  |  |  |  | $ 100 | $ 100 |  | $ 100 |
Preferred Stock Voting Cap |  |  |  |  |  | 4.99% |  |  |  |
Conversion cap, percentage |  |  |  |  |  | 4.99% |  |  | 4.99% |
Distributed to members (in shares) | shares |  |  |  |  | 700,000 |  |  |  |  |
Percentage of outstanding shares of common stock and voting power, affiliated holders |  |  |  |  | 24.90% |  |  |  |  |
Percentage of outstanding shares of common stock and voting power, unaffiliated holders |  |  |  |  | 9.90% |  |  |  |  |
Conversion price (in dollars per share) |  |  |  |  |  | $ 8.33 |  |  |  |
Initial and current conversion price (in dollars per share) |  |  |  |  |  | $ 3.33 |  |  |  |
Series A Preferred Stock | Minimum |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |
Preferred stock rate |  |  |  |  |  | 5.00% |  |  |  |
Series A Preferred Stock | Maximum |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |
Preferred stock rate |  |  |  |  |  | 14.50% |  |  |  |

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