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Note 3 - Net Investment in Sales Type Lease (Details Textual) - USD ($)
1 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2025
Jan. 31, 2021
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2022
Dec. 31, 2024
Sales-Type Lease, Net Investment in Lease, after Allowance for Credit Loss, Current     $ 59,765     $ 75,858
Sales-Type Lease, Net Investment in Lease, after Allowance for Credit Loss, Noncurrent     62,431     $ 46,924
January 2021 [Member]            
Lessor, Sales-type Lease, Term of Contract (Year)   5 years        
Lessor, Sales-type Lease, Implied Interest Rate   6.00%        
Sales-Type Lease, Net Investment in Lease, after Allowance for Credit Loss   $ 210,782        
Inventory Derecognized for Sales-type Leases   $ 139,521        
Sales-type Lease, Lease Income     34,719.98 $ 25,562    
Sales-type Lease, Interest Income     1,955 2,963    
December 2022 [Member]            
Lessor, Sales-type Lease, Term of Contract (Year)         5 years  
Lessor, Sales-type Lease, Implied Interest Rate         6.00%  
Sales-Type Lease, Net Investment in Lease, after Allowance for Credit Loss         $ 98,279  
Inventory Derecognized for Sales-type Leases         $ 46,533  
Sales-type Lease, Lease Income     14,789 12,175    
Sales-type Lease, Interest Income     2,521 $ 3,025    
March 2025 [Member]            
Lessor, Sales-type Lease, Term of Contract (Year) 4 years          
Lessor, Sales-type Lease, Implied Interest Rate 6.00%          
Sales-Type Lease, Net Investment in Lease, after Allowance for Credit Loss $ 53,680          
Inventory Derecognized for Sales-type Leases $ 31,740          
Sales-type Lease, Lease Income     25,327      
Sales-type Lease, Interest Income     $ 889