Note 12 - Capital Stock - Net Proceeds Allocation (Details) - USD ($)	Oct. 03, 2018	Jan. 20, 2017
The 2018 October Offering [Member]
Fair Value of Shares	$ 22,518,788
Proceeds from Issuance or Sale of Equity, Total	20,180,878
Share Issuance Costs - Cash	(1,211,667)
Net Cash Proceeds Received	18,969,211
	18,969,211
The 2018 October Offering [Member] \| October 2018 Warrants [Member]
Fair Value of Share Purchase Warrants	3,094,693
Share Purchase Warrants	2,606,884
The 2018 October Offering [Member] \| Common Stock [Member]
Fair Value of Shares	19,424,095
Shares	$ 16,362,327
The 2017 Offering [Member]
Fair Value of Shares		$ 32,563,419
Proceeds from Issuance or Sale of Equity, Total		25,996,254
Share Issuance Costs - Cash		(1,550,843)
Net Cash Proceeds Received		24,445,411
		24,445,411
The 2017 Offering [Member] \| January 2017 Warrants [Member]
Fair Value of Share Purchase Warrants		5,873,932
Share Purchase Warrants		4,409,570
The 2017 Offering [Member] \| Common Stock [Member]
Fair Value of Shares		26,689,487
Shares		$ 20,035,841

The cash inflow from the issuance of equity net of stock issuance costs.

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Fair value of the entity's equity.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

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The cash outflow for cost incurred directly with the issuance of an equity security.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585

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The cash inflow from the issuance of common stock, preferred stock, treasury stock, stock options, and other types of equity.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
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