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, 2018
USD ($)
Mar. 31, 2017
USD ($)
Number of Primary Types of Products Sold 2  
Depreciation, Depletion and Amortization, Nonproduction, Total [1] $ 37,987 $ 76,790
Depreciation and Amortization, Discontinued Operations   9,745
Selling, General and Administrative Expenses [Member]    
Depreciation, Depletion and Amortization, Nonproduction, Total $ 37,987 $ 76,790
[1] Depreciation and amortization is reflected in selling, general and administrative expenses ($37,987 and $76,790 for the three-month periods ended March 31, 2018 and 2017, and $9,745 was included in discontinued operations for the three-month period ended March 31, 2017).