Shareholders' Equity - Narrative (Details) $ / shares in Units, $ in Thousands				1 Months Ended	3 Months Ended	12 Months Ended
	Feb. 25, 2020 USD ($) shares	Feb. 20, 2020 $ / shares shares	Jun. 24, 2016 USD ($) shares	Aug. 31, 2020 holder shares	Mar. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) day vote $ / shares shares	Sep. 30, 2020 USD ($) $ / shares shares	Sep. 30, 2019 USD ($)	Dec. 10, 2020 USD ($)
Stockholders Equity Note [Line Items]
Number of voting rights per share, common stock | vote						1
Preferred stock, shares authorized (in shares)						10,000,000	10,000,000
Preferred stock, par value (in dollars per share) | $ / shares						$ 0.0001	$ 0.0001
Preferred stock, shares issued (in shares)						700,000	700,000
Preferred stock, shares outstanding (in shares)						700,000	700,000
Preferred stock, liquidation preference (in dollars per share) | $ / shares						$ 100	$ 100
Preferred stock cash dividends declared | $						$ 5,250	$ 5,264	$ 5,250
Volume weighted average price, conversion rate if exceeded						2.5
Conversion trigger | day						20
Conversion cap						120 days
Notice of conversion						10 days
Common stock, par value (in dollars per share) | $ / shares						$ 0.0001	$ 0.0001
Net proceeds from the offering | $	$ 49,200
Repurchase of common stock authorized by board of directors | $									$ 35,000
Preferred Stock Including Additional Paid in Capital
Stockholders Equity Note [Line Items]
Proceeds from sale | $			$ 70,000
Public Offering
Stockholders Equity Note [Line Items]
Aggregate shares sold (in shares)	6,782,610	6,782,610
Common stock, par value (in dollars per share) | $ / shares		$ 0.0001
Sale of stock (in dollars per share) | $ / shares		$ 7.75
Direct costs | $					$ 400
Treasury stock (in shares)	82,287
Over-Allotment Option
Stockholders Equity Note [Line Items]
Aggregate shares sold (in shares)	1,017,390	1,017,390
Option to purchase additional shares, period		30 days
Minimum
Stockholders Equity Note [Line Items]
Special cash dividend rate						1.5
Maximum
Stockholders Equity Note [Line Items]
Special cash dividend rate						2.0
Preferred Stock
Stockholders Equity Note [Line Items]
Preferred stock, shares authorized (in shares)						10,000,000
Preferred stock, par value (in dollars per share) | $ / shares						$ 0.0001
Preferred stock, shares issued (in shares)			700,000			700,000	700,000
Preferred stock, shares outstanding (in shares)						700,000	700,000
Preferred stock, liquidation preference (in dollars per share) | $ / shares						$ 100	$ 100
Preferred stock rate						7.50%
Accrued dividend rate						2.00%
Preferred stock voting cap, percentage			4.99%
Conversion cap, percentage			4.99%
Distributed to members (in shares)				700,000
Affiliated holders | holder				6
Percentage of outstanding shares of common stock and voting power, affiliated holders				24.90%
Unaffiliated holders | holder				12
Percentage of outstanding shares of common stock and voting power, unaffiliated holders				9.90%
Conversion price (in dollars per share) | $ / shares						$ 8.33
Initial and current conversion price (in dollars per share) | $ / shares						$ 3.33
Preferred Stock | Minimum
Stockholders Equity Note [Line Items]
Preferred stock rate						5.00%
Preferred Stock | Maximum
Stockholders Equity Note [Line Items]
Preferred stock rate						14.50%