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Note 4 - Cash - Restricted - Cash and Cash-restricted (Details) - USD ($)
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Dec. 31, 2016
Cash $ 795,332 $ 1,618,583    
Cash-restricted 873,355 33,821    
Cash and cash-restricted $ 1,668,687 $ 1,652,404 $ 1,518,481 $ 1,081,188