Quarterly report pursuant to Section 13 or 15(d)

Note 14 - Segments (Details Textual)

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Note 14 - Segments (Details Textual)
 3 Months Ended 6 Months Ended
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Revenues, Total $ 271,101   $ 260,092 $ 427,373 $ 301,716
Number of Primary Types of Products Sold 2     2  
Depreciation, Depletion and Amortization, Nonproduction, Total [1] $ 19,256   36,726 $ 36,099 73,505
Selling, General and Administrative Expenses [Member]          
Depreciation, Depletion and Amortization, Nonproduction, Total $ 19,256   $ 36,726 $ 36,099 $ 73,505
Intersegment Eliminations [Member]          
Revenues, Total   $ 0      
[1] Depreciation and amortization is reflected in selling, general and administrative expenses ($19,256 and $36,726 for the three-month periods ended June 30, 2020 and 2019, and $36,099 and $73,505 for the six-month periods ended June 30, 2020 and 2019, respectively).