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 6 Months Ended
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Revenues, Total $ 261,046 $ 271,101 $ 384,783 $ 427,373
Number of Primary Types of Products Sold 2   2  
Depreciation, Depletion and Amortization, Nonproduction, Total [1] $ 19,858 $ 19,256 $ 37,606 $ 36,099
Intersegment Eliminations [Member]        
Revenues, Total     $ 0  
[1] Depreciation and amortization are reflected in selling, general and administrative expenses ($19,858 and $19,256 for the three-month periods ended June 30, 2021 and 2020, and $37,606 and $36,099 for the six-month periods ended June 30, 2021 and 2020, respectively).