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Note 2 - Basis of Presentation and Significant Accounting Policies (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		5 Months Ended	9 Months Ended		12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021	Apr. 29, 2022	Aug. 02, 2021	Jul. 30, 2020
Investments, Cost, Nonaccrual Status	$ 0		$ 0	$ 0
Investments, Fair Value, Nonaccrual Status	0		0	0
Investments, Nonaccrual, Interest Income	$ 0	$ 0		$ 0	$ 1,300
Investment, Nonaccrual, Income Not Received in Cash, Percent	7.00%	5.20%		7.50%	6.70%
Debt Issuance Costs, Net, Total	$ 5,600		5,600	$ 5,600		$ 4,300
Deferred Finance Costs, Accumulated Amortization	4,400		$ 4,400	4,400		3,200
Amortization of Debt Issuance Costs	$ 400	$ 200		$ 1,142	$ 744
Adjustments to Additional Paid in Capital, Non-deductible Excise Taxes Paid						400
Federal Excise Tax, Percent	4.00%		4.00%	4.00%
Excise and Sales Taxes	$ 100	$ 56		$ 306	174
Unrecognized Tax Benefits, Ending Balance	$ 0		$ 0	$ 0		0
Open Tax Year				2021 2020 2019
Proceeds from Issuance of Common Stock				$ 67,525	$ 17,312
Stock Repurchase Program, Remaining Authorized Repurchase Amount							$ 5,000
Stock Repurchased During Period, Shares (in shares)	0	0	167,465	0	0
Stock Repurchased During Period, Per Share (in dollars per share)			$ 11.22
Stock Repurchased During Period, Value			$ 1,900
The 2020 Equity Distribution Agreement [Member]
Equity Sales Agreement, Maximum Value									$ 100,000
The 2021 Equity Distribution Agreement [Member]
Equity Sales Agreement, Maximum Value								$ 100,000
Stock Issued During Period, Shares, New Issues (in shares)	1,523,519			2,641,920
Proceeds from Issuance of Common Stock	$ 19,000			$ 33,200
Payments of Stock Issuance Costs	400			600
Equity Sales Agreement, Remaining Amount Available for Issuance	$ 48,900		$ 48,900	$ 48,900
The 2020 Equity Distribution Agreement and the 2021 Equity Distribution Agreement [Member]
Stock Issued During Period, Shares, New Issues (in shares)		395,068			1,122,516
Proceeds from Issuance of Common Stock		$ 6,600			$ 17,300
Payments of Stock Issuance Costs		$ 200			$ 500
One Investment [Member]
Investments, Cost, Nonaccrual Status						11,500
Investments, Fair Value, Nonaccrual Status						$ 6,900

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- Definition

Amount of increase to additional paid in capital for non-deductible excise taxes paid.

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Per share value of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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