Note 11 - Income Taxes (Details Textual) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Operating Loss Carryforwards, Total	$ 24,500,000		$ 24,500,000
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	$ 400,000	$ 2,100,000	$ (3,200,000)	$ 2,900,000
Domestic Tax Authority [Member] | Canada Revenue Agency [Member]
Open Tax Year			2015 2016 2017 2018