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Note 6 - Legal Proceedings (Details Textual) - USD ($)		1 Months Ended
Note 6 - Legal Proceedings (Details Textual) - USD ($)	Mar. 16, 2021	Mar. 31, 2022	Feb. 28, 2022
Benchmark Investments, Inc. v. Yunhong CTI Ltd [Member]
Loss Contingency, Damages Sought, Value	$ 500,000
Loss Contingency Accrual, Ending Balance		$ 0
Engie Resources LLC Case [Member]
Loss Contingency Accrual, Ending Balance		60,000
Loss Contingency Accrual, Payments			$ 94,000
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Total		$ 75,000