Note 3 - Loans Held for Investment, Net - Summary of Loans Held for Investment (Details) $ in Thousands		3 Months Ended		12 Months Ended
		Mar. 31, 2022 USD ($)		Dec. 31, 2021 USD ($)
Outstanding Face Amount		$ 1,010,076		$ 1,034,542
Carrying Value	[1]	$ 1,056,155		$ 1,088,881
Loan count		47		51
Weighted average, fixed rate	[2]	95.52%		95.48%
Weighted average, coupon		6.23%	[3]	5.77%	[4]
Weighted average, life (Year)		5 years 10 months 24 days	[5]	6 years 2 months 12 days	[6]
Mortgage Loans [Member]
Outstanding Face Amount		$ 700,309		$ 795,223
Carrying Value	[1]	$ 744,525		$ 847,364
Loan count		17		21
Weighted average, fixed rate	[2]	100.00%		100.00%
Weighted average, coupon		4.82%	[3]	4.85%	[4]
Weighted average, life (Year)		6 years 1 month 13 days	[5]	6 years 5 months 12 days	[6]
Mezzanine Loan [Member]
Outstanding Face Amount		$ 150,603		$ 152,144
Carrying Value	[1]	$ 152,974		$ 154,516
Loan count		22		23
Weighted average, fixed rate	[2]	69.98%		69.28%
Weighted average, coupon		8.94%	[3]	8.03%	[4]
Weighted average, life (Year)		6 years 3 months 18 days	[5]	6 years 6 months	[6]
Preferred Equity [Member]
Outstanding Face Amount		$ 100,029		$ 66,697
Carrying Value	[1]	$ 99,788		$ 66,624
Loan count		6		6
Weighted average, fixed rate	[2]	100.00%		100.00%
Weighted average, coupon		10.43%	[3]	10.52%	[4]
Weighted average, life (Year)		6 years 2 months 15 days	[5]	3 years 10 months 2 days	[6]
Convertible Note [Member]
Outstanding Face Amount		$ 59,135		$ 20,478
Carrying Value	[1]	$ 58,868		$ 20,377
Loan count		2		1
Weighted average, fixed rate	[2]	100.00%		100.00%
Weighted average, coupon		9.00%	[3]	9.00%	[4]
Weighted average, life (Year)		1 year 8 months 26 days	[5]	1 year 11 months 26 days	[6]

[1] Carrying value includes the outstanding face amount plus unamortized purchase premiums/discounts and any allowance for loan losses.

[2] The weighted-average of loans paying a fixed rate is weighted on current principal balance.

[3] The weighted-average coupon is weighted on outstanding face amount.

[4] The weighted-average coupon is weighted on current principal balance.

[5] The weighted-average life is weighted on outstanding face amount and assumes no prepayments. The maturity date for preferred equity investments represents the maturity date of the senior mortgage, as the preferred equity investments require repayment upon the sale or refinancing of the asset.

[6] The weighted-average life is weighted on current principal balance and assumes no prepayments. The maturity date for preferred equity investments represents the maturity date of the senior mortgage, as the preferred equity investments require repayment upon the sale or refinancing of the asset.