Note 9 - Subsequent Events (Details Textual) - Subsequent Event [Member] - Intellectual Property and License and Service Agreement [Member]	Nov. 08, 2018 USD ($)	Oct. 24, 2018 USD ($)
Number of Patents Sold		2
Disposition of Assets, Consideration Receivable		$ 750,000
Proceeds from Sale of Intangible Assets	$ 500,000
Disposition of Intangible Assets, Consideration Receivable, Period Within Delivery for Balance to Become Due		15 days
JAPAN
Disposition of Intangible Assets, Noncompete Period		5 years