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Note 4 - Cash - Restricted - Cash and Cash-restricted (Details) - USD ($)
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Cash $ 1,585,950 $ 1,618,583    
Cash-restricted 993,160 33,821    
Cash and cash-restricted $ 2,579,110 $ 1,652,404 $ 1,020,791 $ 1,081,188