Quarterly report pursuant to Section 13 or 15(d)

Note 4 - Restricted Cash - Reconciliation of Cash, Cash Equivalents and Restricted Cash Balance (Details)

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Note 4 - Restricted Cash - Reconciliation of Cash, Cash Equivalents and Restricted Cash Balance (Details) - USD ($)
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Dec. 31, 2016
Cash and cash equivalents $ 4,583,025 $ 4,216,221 $ 3,046,777  
Restricted cash 124,899 103,819 280,414  
Total cash, cash equivalents and restricted cash $ 4,707,924 $ 4,320,040 $ 3,327,191 $ 3,344,258