Note 6 - Accounts Payable and Accrued Liabilities - Accounts Payable and Accrued Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Accounts payable	$ 15,331	$ 16,115
Accrued property taxes	2,543	2,835
Accrued payroll	2,605	2,151
Workers' compensation reserve	3,699	3,446
Group health insurance	2,100	2,500
Other	3,277	3,039
Total accounts payable and accrued liabilities	32,801	31,800
Interest Rate Swap [Member]
Fair value of interest rate swaps	$ 3,246	$ 1,714