Note 6 - Accounts Payable and Accrued Liabilities - Accounts Payable and Accrued Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Accounts payable	$ 20,890	$ 14,785
Accrued property taxes	2,939	2,566
Accrued payroll	3,918	1,621
Workers' compensation reserve	3,137	2,988
Group health insurance	1,800	1,800
Fair value of interest rate swaps	1,563	2,793
Other	5,006	4,856
Total accounts payable and accrued liabilities	$ 39,253	$ 31,409