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Note 3 - Net Investment in Sales Type Lease (Details Textual) - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
Jan. 31, 2021
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Sales-Type Lease, Net Investment in Lease, after Allowance for Credit Loss, Current   $ 63,487   $ 59,173
Sales-Type Lease, Net Investment in Lease, after Allowance for Credit Loss, Noncurrent   161,089   $ 176,444
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   6,794 $ 9,622  
Sales-type Lease, Interest Income   2,809 $ 2,603  
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   4,247    
Sales-type Lease, Interest Income   $ 1,453