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Note 4 - Cash - Restricted (Details Textual)
6 Months Ended
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Number of Land Parcels Sold 4    
Proceeds from Sale of Property, Plant, and Equipment, Total $ 996,494 $ 3,390  
Restricted Cash and Cash Equivalents, Current, Total 873,355   $ 33,821
Land [Member]      
Proceeds from Sale of Property, Plant, and Equipment, Total $ 993,160