Note 13 - Grants to Trustees (Details Textual)		9 Months Ended	12 Months Ended
	Dec. 13, 2021 $ / shares shares	Sep. 30, 2022 $ / shares shares	Dec. 31, 2021 $ / shares shares	Dec. 31, 2020 $ / shares shares
Number of Independent Trustees	5
Number of Trustee Emeritus	1
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)	29,825	205,281	1,024,808	511,621
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)	29,825	325,112	904,215	1,108,014
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares	$ 9.32	$ 11.84	$ 5.99	$ 5.76