Note 9 - Patents - Summary of Patents (Details) - USD ($)	Jun. 30, 2018	Dec. 31, 2017
Patents, cost	$ 4,017,509	$ 4,017,510
Patents, accumulated amortization	(1,697,117)	(1,227,762)
Patents, net	2,320,392	2,789,748
Foundation Intellectual Property Patents [Member]
Patents, cost	1,377,863	1,377,863
Patents, accumulated amortization	(817,235)	(787,821)
Patents, net	560,628	590,042
Epidural-Apad Patents [Member]
Patents, cost	2,639,646	2,639,647
Patents, accumulated amortization	(879,882)	(439,941)
Patents, net	$ 1,759,764	$ 2,199,706

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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-Publisher FASB
-Name Accounting Standards Codification
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