Note 3 - Patents, Net (Tables)

12 Months Ended

Dec. 31, 2016

Notes Tables

Schedule of Finite-Lived Intangible Assets [Table Text Block]

	2016			2015
Patents	$	289,228		$	188,584
Less: accumulated amortization		(133,165	)		(116,479	)
Patents, net	$	156,063		$	72,105

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]

2017	$	16,807
2018		15,444
2019		9,793
2020		6,584
2021		4,379
Thereafter		103,056
Total expense	$	156,063