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Note 11 - Distributions - Distribution Activity (Details) - USD ($) $ / shares in Units, $ in Thousands				9 Months Ended	12 Months Ended
	Mar. 18, 2024	Feb. 23, 2024	Oct. 27, 2023	Sep. 30, 2023	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Distributions declared per share (in dollars per share)			$ 0.11	$ 1.37	$ 1.37	$ 1.28	$ 1.25
Dividends, cash				$ 38,418		$ 32,659
Dividends, shares (in shares)				127,486		61,859
Dividends, stock				$ 1,623		$ 754
May 16, 2024 Dividend [Member] | Forecast [Member]
Distributions declared per share (in dollars per share)		$ 0.11
March 18, 2024 Dividend [Member] | Forecast [Member]
Distributions declared per share (in dollars per share)	$ 0.05	0.11
May 17, 2024 Dividend [Member] | Forecast [Member]
Distributions declared per share (in dollars per share)		$ 0.11
First 10/27/2023 Dividend [Member]
Record date					Feb. 16, 2024
Payment date					Mar. 15, 2024
Distributions declared per share (in dollars per share)					$ 0.11
Dividends, cash					$ 0
Dividends, shares (in shares)					0
Dividends, stock					$ 0
Second 10/27/2023 Dividend [Member]
Record date					Jan. 18, 2024
Payment date					Feb. 14, 2024
Distributions declared per share (in dollars per share)					$ 0.11
Dividends, cash					$ 3,462
Dividends, shares (in shares)					15,873
Dividends, stock					$ 210
Third 10/27/2023 Dividend [Member]
Record date					Dec. 19, 2023
Payment date					Jan. 16, 2024
Distributions declared per share (in dollars per share)					$ 0.11
Dividends, cash					$ 3,472
Dividends, shares (in shares)					14,563
Dividends, stock					$ 199
Fourth 10/27/2023 Dividend [Member]
Record date					Nov. 17, 2023
Payment date					Dec. 15, 2023
Distributions declared per share (in dollars per share)					$ 0.05
Dividends, cash					$ 1,574
Dividends, shares (in shares)					7,137
Dividends, stock					$ 93
First 7/28/2023 Dividend [Member]
Record date				Nov. 17, 2023
Payment date				Dec. 15, 2023
Distributions declared per share (in dollars per share)				$ 0.11
Dividends, cash				$ 3,463
Dividends, shares (in shares)				15,701
Dividends, stock				$ 206
Second 7/28/2023 Dividend [Member]
Record date				Oct. 18, 2023
Payment date				Nov. 11, 2023
Distributions declared per share (in dollars per share)				$ 0.11
Dividends, cash				$ 3,493
Dividends, shares (in shares)				14,022
Dividends, stock				$ 173
Third 7/28/2023 Dividend [Member]
Record date				Sep. 19, 2023
Payment date				Oct. 16, 2023
Distributions declared per share (in dollars per share)				$ 0.11
Dividends, cash				$ 3,445
Dividends, shares (in shares)				15,067
Dividends, stock				$ 184
First 4/28/2023 Dividend [Member]
Record date				Aug. 17, 2023
Payment date				Sep. 15, 2023
Distributions declared per share (in dollars per share)				$ 0.11
Dividends, cash				$ 3,458
Dividends, shares (in shares)				8,665
Dividends, stock				$ 106
Second 4/28/2023 [Member]
Record date				Jul. 18, 2023
Payment date				Aug. 15, 2023
Distributions declared per share (in dollars per share)				$ 0.11
Dividends, cash				$ 3,427
Dividends, shares (in shares)				8,307
Dividends, stock				$ 105
Third 4/28/2023 Dividend [Member]
Record date				Jun. 16, 2023
Payment date				Jul. 14, 2023
Distributions declared per share (in dollars per share)				$ 0.11
Dividends, cash				$ 3,434
Dividends, shares (in shares)				7,424
Dividends, stock				$ 96
First 2/23/2023 Dividend [Member]
Record date				May 18, 2023
Payment date				Jun. 14, 2023
Distributions declared per share (in dollars per share)				$ 0.11
Dividends, cash				$ 3,087
Dividends, shares (in shares)				7,128
Dividends, stock				$ 86
Second 2/23/2023 Dividend [Member]
Record date				Apr. 18, 2023
Payment date				May 16, 2023
Distributions declared per share (in dollars per share)				$ 0.11
Dividends, cash				$ 3,068
Dividends, shares (in shares)				6,705
Dividends, stock				$ 84
Third 2/23/2023 Dividend [Member]
Record date				Mar. 17, 2023
Payment date				Apr. 14, 2023
Distributions declared per share (in dollars per share)				$ 0.11
Dividends, cash				$ 3,035
Dividends, shares (in shares)				6,894
Dividends, stock				$ 81
First 10/28/2022 Dividend [Member]
Record date						Feb. 17, 2023
Payment date						Mar. 15, 2023
Distributions declared per share (in dollars per share)						$ 0.11
Dividends, cash						$ 3,040
Dividends, shares (in shares)						6,764
Dividends, stock						$ 75
Second 10/28/2022 Dividend [Member]
Record date						Jan. 18, 2023
Payment date						Feb. 15, 2023
Distributions declared per share (in dollars per share)						$ 0.11
Dividends, cash						$ 3,021
Dividends, shares (in shares)						5,754
Dividends, stock						$ 74
Third 10/28/2022 Dividend [Member]
Record date						Dec. 19, 2022
Payment date						Jan. 13, 2023
Distributions declared per share (in dollars per share)						$ 0.11
Dividends, cash						$ 2,978
Dividends, shares (in shares)						5,618
Dividends, stock						$ 69
Fourth 10/28/2022 Dividend [Member]
Record date						Nov. 17, 2022
Payment date						Dec. 15, 2022
Distributions declared per share (in dollars per share)						$ 0.05
Dividends, cash						$ 1,319
Dividends, shares (in shares)						2,171
Dividends, stock						$ 27
First 7/29/2022 Dividend [Member]
Record date						Nov. 17, 2022
Payment date						Dec. 15, 2022
Distributions declared per share (in dollars per share)						$ 0.1
Dividends, cash						$ 2,638
Dividends, shares (in shares)						4,341
Dividends, stock						$ 57
Second 7/29/2022 Dividend [Member]
Record date						Oct. 18, 2022
Payment date						Nov. 15, 2022
Distributions declared per share (in dollars per share)						$ 0.1
Dividends, cash						$ 2,580
Dividends, shares (in shares)						4,621
Dividends, stock						$ 60
Third 7/29/2022 Dividend [Member]
Record date						Sep. 19, 2022
Payment date						Oct. 14, 2022
Distributions declared per share (in dollars per share)						$ 0.1
Dividends, cash						$ 2,558
Dividends, shares (in shares)						7,703
Dividends, stock						$ 81
First 4/29/22 Dividend [Member]
Record date						Aug. 18, 2022
Payment date						Sep. 15, 2022
Distributions declared per share (in dollars per share)						$ 0.1
Dividends, cash						$ 2,528
Dividends, shares (in shares)						4,925
Dividends, stock						$ 60
Second 4/29/2022 Dividend [Member]
Record date						Jul. 19, 2022
Payment date						Aug. 16, 2022
Distributions declared per share (in dollars per share)						$ 0.1
Dividends, cash						$ 2,484
Dividends, shares (in shares)						3,939
Dividends, stock						$ 55
Third 4/29/2022 Dividend [Member]
Record date						Jun. 17, 2022
Payment date						Jul. 15, 2022
Distributions declared per share (in dollars per share)						$ 0.1
Dividends, cash						$ 2,434
Dividends, shares (in shares)						4,286
Dividends, stock						$ 51
First 2/25/2022 Dividend [Member]
Record date						May 18, 2022
Payment date						Jun. 15, 2022
Distributions declared per share (in dollars per share)						$ 0.1
Dividends, cash						$ 2,378
Dividends, shares (in shares)						4,428
Dividends, stock						$ 50
Second 2/25/2022 Dividend [Member]
Record date						Apr. 19, 2022
Payment date						May 16, 2022
Distributions declared per share (in dollars per share)						$ 0.1
Dividends, cash						$ 2,349
Dividends, shares (in shares)						4,088
Dividends, stock						$ 49
Third 2/25/2022 Dividend [Member]
Record date						Mar. 18, 2022
Payment date						Apr. 14, 2022
Distributions declared per share (in dollars per share)						$ 0.1
Dividends, cash						$ 2,352
Dividends, shares (in shares)						3,221
Dividends, stock						$ 46

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