Note 9 - Convertible Notes - Convertible Notes (Details) (Parentheticals)	3 Months Ended	12 Months Ended
Mar. 31, 2019	Dec. 31, 2018
Convertible Notes 1[Member]
Interest Rate	7.00%	7.00%
Conversion Rights	335,833	335,833
Convertible Notes 2 [Member]
Interest Rate	5.00%	5.00%
Conversion Rights	2,775,690	2,775,690
Maturing Dates Range	May 2018 and March 2021	May 2018 and March 2021

The number of equity instruments that the holder of the debt instrument would receive if the debt was converted to equity.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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