Quarterly report pursuant to Section 13 or 15(d)

Note 15 - Segments (Details Textual)

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Note 15 - Segments (Details Textual)
 3 Months Ended
Mar. 31, 2021
USD ($)
Mar. 31, 2020
USD ($)
Revenues, Total $ 123,737 $ 156,272
Number of Primary Types of Products Sold 2  
Depreciation, Depletion and Amortization, Nonproduction, Total [1] $ 17,748 16,843
Selling, General and Administrative Expenses [Member]    
Depreciation, Depletion and Amortization, Nonproduction, Total 17,748 $ 16,843
Intersegment Eliminations [Member]    
Revenues, Total $ 0  
[1] Depreciation and amortization are reflected in selling, general and administrative expenses ($17,748 and $16,843 for the three-month periods ended March 31, 2021 and 2020, respectively).