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Fair Value of Financial Instruments - Carrying Values and Fair Values of Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total debt	$ 283,441	$ 310,265
Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total debt	47,850	47,058
Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total debt	0	0
Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total debt	235,591	263,207
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total debt	300,058	331,750
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total debt	283,441	310,265
PWB Credit Facility | Line of Credit
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total debt	0	0
PWB Credit Facility | Line of Credit | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total debt	0	0
PWB Credit Facility | Line of Credit | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total debt	0	0
PWB Credit Facility | Line of Credit | Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total debt	0	0
PWB Credit Facility | Line of Credit | Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total debt	0	0
PWB Credit Facility | Line of Credit | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total debt	0	0
BNP Facility | Line of Credit
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total debt	91,100	104,700
BNP Facility | Line of Credit | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total debt	0	0
BNP Facility | Line of Credit | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total debt	0	0
BNP Facility | Line of Credit | Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total debt	91,100	104,700
BNP Facility | Line of Credit | Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total debt	91,100	104,700
BNP Facility | Line of Credit | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total debt	91,100	104,700
Unsecured Notes Due February 2026 | Unsecured Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total debt	113,799	109,037
Unsecured Notes Due February 2026 | Unsecured Notes | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total debt	0	0
Unsecured Notes Due February 2026 | Unsecured Notes | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total debt	0	0
Unsecured Notes Due February 2026 | Unsecured Notes | Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total debt	113,799	109,037
Unsecured Notes Due February 2026 | Unsecured Notes | Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total debt	123,129	122,547
Unsecured Notes Due February 2026 | Unsecured Notes | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total debt	113,799	109,037
Unsecured Notes Due October 2028 | Unsecured Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total debt	47,850	47,058
Unsecured Notes Due October 2028 | Unsecured Notes | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total debt	47,850	47,058
Unsecured Notes Due October 2028 | Unsecured Notes | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total debt	0	0
Unsecured Notes Due October 2028 | Unsecured Notes | Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total debt	0	0
Unsecured Notes Due October 2028 | Unsecured Notes | Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total debt	53,959	53,806
Unsecured Notes Due October 2028 | Unsecured Notes | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total debt	47,850	47,058
SBA Debentures | Debentures
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total debt	30,692	49,470
SBA Debentures | Debentures | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total debt	0	0
SBA Debentures | Debentures | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total debt	0	0
SBA Debentures | Debentures | Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total debt	30,692	49,470
SBA Debentures | Debentures | Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total debt	31,870	50,697
SBA Debentures | Debentures | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total debt	$ 30,692	$ 49,470

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+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 470
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-Name Accounting Standards Codification
-Section 55
-Paragraph 69B
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-URI https://asc.fasb.org//1943274/2147481568/470-20-55-69B

Reference 2: http://www.xbrl.org/2003/role/exampleRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
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-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482907/825-10-50-10

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+ References

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