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 ($)
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Dec. 31, 2016
Cash and cash equivalents $ 5,611,008 $ 4,216,221 $ 2,628,648  
Restricted cash 185,396 103,819 157,470  
Total cash, cash equivalents and restricted cash $ 5,796,404 $ 4,320,040 $ 2,786,118 $ 3,344,258