Quarterly report pursuant to Section 13 or 15(d)

Note 3 - Restricted Cash - Reconciliation of Cash, Cash Equivalents and Restricted Cash Balance (Details)

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Note 3 - Restricted Cash - Reconciliation of Cash, Cash Equivalents and Restricted Cash Balance (Details) - USD ($)
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Cash and cash equivalents $ 4,033,730 $ 4,216,221 $ 2,676,607  
Restricted cash 134,189 103,819 312,551  
Total cash, cash equivalents and restricted cash $ 4,167,919 $ 4,320,040 $ 2,989,158 $ 3,344,258