Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Statement of Financial Position [Abstract]
Loans receivable, at fair value	$ 98,729	$ 167,744
Preferred stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Preferred stock, shares authorized (in shares)	1,000,000	1,000,000
Preferred stock, shares issued (in shares)	4,545	4,512
Preferred stock, shares outstanding (in shares)	4,545	4,512
Preferred stock, liquidation preference	$ 113,615	$ 112,790
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized (in shares)	100,000,000	100,000,000
Common stock, shares issued (in shares)	28,523,764	27,591,028
Common stock, shares outstanding (in shares)	28,523,764	27,591,028