Subsequent Events (Details) - USD ($) $ in Thousands		1 Months Ended	12 Months Ended
	Feb. 05, 2019	Mar. 31, 2023	Feb. 28, 2023	May 31, 2023	May 01, 2023	Jan. 27, 2023	Jul. 14, 2022	Feb. 28, 2021	Feb. 07, 2020	Dec. 21, 2019	May 10, 2013
Subsequent Events (Details) [Line Items]
Debt Instrument, Face Amount			$ 350,000		$ 10,000		$ 43,100	$ 74,450	$ 74,450	$ 74,450	$ 48,300
Unusual or Infrequent Item, or Both, Net of Insurance Proceeds	$ 19,200
Interest rate						0.10%
Subsequent events, description			On April 14, 2023, we issued $50.0 million in aggregate principal amount of 8.50% fixed-rate notes due 2028 (the “8.50% 2028 Notes”) for net proceeds of $48.2 million, based on a public offering price of 100% of par, after deducting underwriting discounts and commissions of approximately $1.6 million and estimated offering expenses of approximately $0.2 million. On April 25, 2023, the underwriters exercised their option in full to purchase an additional $7.5 million in aggregate principal amount of its 8.50% notes due 2028 within 30 days. Net proceeds to the Company were $7.3 million after deducting underwriting commissions of approximately $0.2 million. The 8.50% 2028 Notes are listed on the NYSE under the trading symbol “SAZ” with a par value of $25.00 per share. Interest on the 8.50% 2028 Notes will be paid quarterly in arrears on February 28, May 31, August 31 and November 30, at a rate of 8.50% per year, beginning May 31, 2023. The 8.50% 2028 Notes mature on April 15, 2028 and commencing April 14, 2025, may be redeemed in whole or in part at any time or from time to time at our option. We intend to use the net proceeds of the offering to repay a portion of outstanding indebtedness under the Encina Credit Facility, make investments in middle-market companies in accordance with our investment objective and strategies (including investments made through SBIC III LP) and for general corporate purposes.
8.75% 2025 [Member] | Subsequent Event [Member]
Subsequent Events (Details) [Line Items]
Debt Instrument, Face Amount		$ 10,000
Unusual or Infrequent Item, or Both, Net of Insurance Proceeds		$ 9,600
Customary fees percentage		3.50%
Offering expenses		$ 100
7.75% 2025 [Member] | Subsequent Event [Member]
Subsequent Events (Details) [Line Items]
Interest rate				8.75%