Note 11 - Income Taxes (Details Textual) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Operating Loss Carryforwards, Total	$ 23,100,000		$ 23,100,000
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	$ (3,900,000)	$ 400,000	$ (3,600,000)	$ 800,000
Domestic Tax Authority [Member] | Canada Revenue Agency [Member]
Open Tax Year			2015 2016 2017 2018