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Note 2 - Liquidity and Going Concern (Details Textual) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Net Income (Loss) Attributable to Parent, Total	$ (3,094,688)	$ 250,204	$ (3,975,108)	$ (212,804)	$ (3,600,000)	$ (1,600,000)	$ 700,000

X

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

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