Note 6 - Accounts Payable and Accrued Liabilities - Accounts Payable and Accrued Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Accounts payable	$ 14,785	$ 16,115
Accrued property taxes	2,566	2,835
Accrued payroll	1,621	2,151
Workers' compensation reserve	2,988	3,446
Group health insurance	1,800	2,500
Other	7,649	4,753
Total accounts payable and accrued liabilities	$ 31,409	$ 31,800