Quarterly report pursuant to Section 13 or 15(d)

Note 16 - Supplemental Disclosure for Statements of Cash Flows (Details Textual)

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Note 16 - Supplemental Disclosure for Statements of Cash Flows (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2019
Mar. 31, 2018
Jun. 30, 2019
Jun. 30, 2018
Interest Paid, Excluding Capitalized Interest, Operating Activities     $ 6,000 $ 4,000
Stock Issued During Period, Shares, Employee Benefit Plan     8,128 4,734
Stock Issued During Period, Value, Employee Benefit Plan $ 19,588 $ 35,980 $ 20,000 $ 36,000