Note 4 - Debt - Summary of Credit and Other Debt Facilities (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Interest Rate
Balance	$ 17,980	$ 11,042
Balance outstanding	$ 1,376	$ 700
USA - North Mill Capital [Member]
Interest Rate	5.25%	5.38%
Balance	$ 14,399	$ 9,680
Investec Bank Ltd. [Member]
Interest Rate	10.50%
Balance	$ 1,700	$ 0
Balance outstanding	$ 1,376	$ 0
USA - Resource Plus Sellers, Short-term [Member]
Interest Rate	1.85%	1.87%
Balance	$ 1,000	$ 300
USA - Resource Plus Sellers [Member]
Interest Rate	0.00%	1.87%
Balance outstanding	$ 0	$ 700
National Australia Bank [Member]
Interest Rate	10.60%	6.76%
Balance	$ 156	$ 118
People's Bank of China [Member]
Interest Rate	0.00%	3.71%
Balance	$ 0	$ 157
Industrial Bank [Member]
Interest Rate	4.00%	6.17%
Balance	$ 435	$ 472
Industrial Bank and Commercial Bank of China [Member]
Interest Rate	4.15%	4.23%
Balance	$ 290	$ 315