Note 8 - Bonds Payable, Loans Payable and Interest - Bonds Payable (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022	May 20, 2021
Total Bonds payable, net	$ 162,316	$ 162,210
Series 2021 Bonds [Member]
Series 2021 Bonds Principal	166,340	166,340	$ 166,300
Premium on bonds	249	249	$ 200
Bond proceeds	166,589	166,589
Debt issuance costs	(4,753)	(4,753)
Accumulated amortization of debt issuance costs and bond premium	480	374
Total Bonds payable, net	$ 162,316	$ 162,210