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Note 24 - Subsequent Events (Details Textual) - USD ($)
 1 Months Ended 3 Months Ended 12 Months Ended
Mar. 16, 2021
Oct. 31, 2020
Mar. 31, 2021
Dec. 31, 2020
Jan. 31, 2021
Dec. 31, 2019
Proceeds from Advances on Proposed Equity Financing   $ 1,500,000        
Preferred Stock, No Par Value (in dollars per share)       $ 0   $ 0
Stock Issued During Period, Shares, Warrants Exercised (in shares)       391,308    
Subsequent Event [Member]            
Stock Issued During Period, Shares, Warrants Exercised (in shares)     103,104      
Subsequent Event [Member] | Benchmark Investments, Inc. v. Yunhong CTI Ltd [Member]            
Loss Contingency, Damages Sought, Value $ 500,000          
Subsequent Event [Member] | Series C Preferred Stock [Member]            
Equity Financing Agreement, Maximum Number of Shares to Purchase (in shares)         170,000  
Preferred Stock, No Par Value (in dollars per share)         $ 0  
Convertible Preferred Stock, Shares Issued upon Conversion (in shares)         10  
Equity Financing Agreement, Purchase Price (in dollars per share)         $ 0.88  
Equity Financing Agreement, Aggregate Gross Proceeds         $ 1,500,000