Note 4 - Credit Facilities - Unused Availability (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
United States, (excluding Resource Plus facility)	$ 6,674	$ 10,963
UNITED STATES
United States, (excluding Resource Plus facility)	5,319	10,238
MEXICO
United States, (excluding Resource Plus facility)	743	262
CHINA
United States, (excluding Resource Plus facility)	157
AUSTRALIA
United States, (excluding Resource Plus facility)	$ 455	$ 463