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Note 6 - Investments in Joint Ventures (Details Textual) - USD ($)
1 Months Ended
Aug. 31, 2023
Aug. 31, 2024
Tianjin Zerust [Member]    
Subsidiary, Ownership Percentage, Parent   60.00%
Tianjin Zerust [Member]    
Equity Method Investment, Deferred Gain on Sale $ 676,614  
Tianjin Zerust [Member] | NTI Asean LLC [Member]    
Equity Method Investment, Deferred Gain on Sale 1,986,027  
Discontinued Operation, Tax Effect of Gain (Loss) from Disposal of Discontinued Operation 198,603  
Legal Fees 95,890  
Management Bonus Expense $ 250,000