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Note 2 - Restricted Cash - Cash and Cash-restricted (Details) - USD ($)
Jun. 30, 2019
Dec. 31, 2018
Jun. 30, 2018
Dec. 31, 2017
Cash $ 2,484,361 $ 1,860,736    
Restricted cash 104,424    
Total $ 2,588,785 $ 1,860,736 $ 1,668,687 $ 1,652,404