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Note 12 - Subsequent Events (Details Textual) - USD ($) $ in Thousands							1 Months Ended	12 Months Ended
		Feb. 24, 2023	Feb. 14, 2023	Feb. 03, 2023	Feb. 01, 2023	Jan. 24, 2023	Jan. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Proceeds from Issuance of Common Stock								$ 84,603	$ 30,086	$ 44,611
Long-Term Debt, Gross	[1]							$ 439,323	$ 260,250	$ 187,625	$ 154,375	$ 127,875
The 2021 Equity Distribution Agreement [Member]
Stock Issued During Period, Shares, New Issues (in shares)								3,982,684
Proceeds from Issuance of Common Stock								$ 50,300
Payments of Stock Issuance Costs								$ 1,000
Subsequent Event [Member] | Britecore Holdings, Inc. [Member] | Debt Investments [Member]
Payments to Acquire Investments, Total		$ 5,000
Subsequent Event [Member] | Noodle Partners, Inc. [Member] | Debt Investments [Member]
Payments to Acquire Investments, Total		$ 20,000
Subsequent Event [Member] | Canary Medical Inc. [Member]
Repayments of Debt					$ 7,500
Subsequent Event [Member] | Unagi, Inc [Member]
Repayments of Debt				$ 3,200
Long-Term Debt, Gross				$ 2,100
Subsequent Event [Member] | Embody, Inc. [Member]
Repayments of Debt			$ 2,500
Subsequent Event [Member] | Asset Purchase Agreement with CVKD [Member] | HESP LLC [Member]
Asset Purchase Agreement, Number of Shares Received in IPO (in shares)						600,000
Subsequent Event [Member] | The 2021 Equity Distribution Agreement [Member]
Stock Issued During Period, Shares, New Issues (in shares)							555,654
Proceeds from Issuance of Common Stock							$ 6,600
Payments of Stock Issuance Costs							$ 100
[1] Total amount of senior securities outstanding at the end of the period presented.

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The number of shares received on initial public offering in asset purchase agreement.

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+ References

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The cash outflow for cost incurred directly with the issuance of an equity security.

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The cash outflow associated with the purchase of all investments (debt, security, other) during the period.

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+ References

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