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Note 3 - Net Investment in Sales Type Lease (Details Textual) - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
Mar. 31, 2025
Jan. 31, 2021
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2022
Dec. 31, 2025
Sales-Type Lease, Net Investment in Lease, after Allowance for Credit Loss, Current $ 54,806   $ 45,386 $ 54,806   $ 54,806
Sales-Type Lease, Net Investment in Lease, after Allowance for Credit Loss, Noncurrent $ 53,842   45,125 53,842   $ 53,842
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     12,044 11,401    
Sales-type Lease, Interest Income     181 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     5,082 4,787    
Sales-type Lease, Interest Income     618 $ 3,025    
March 2025 [Member]            
Lessor, Sales-type Lease, Term of Contract (Year) 4 years     4 years    
Lessor, Sales-type Lease, Implied Interest Rate 6.00%     6.00%    
Sales-Type Lease, Net Investment in Lease, after Allowance for Credit Loss $ 53,680     $ 53,680    
Inventory Derecognized for Sales-type Leases $ 31,740          
Sales-type Lease, Lease Income     1,012 0    
Sales-type Lease, Interest Income     $ 219 $ 0