Note 1 - Nature of Operations, Basis of Presentation and Company Conditions (Details Textual) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2020 CAD ($)	Apr. 01, 2020 USD ($)	Dec. 31, 2019 USD ($)
Number of Reportable Segments					3
Restricted Cash and Cash Equivalents, Total	$ 2,300,000				$ 2,300,000
Goodwill, Ending Balance	7,006,000				7,006,000			$ 7,000,000	$ 0
Finite-Lived Intangible Assets, Gross, Total	13,700,000				13,700,000
Net Income (Loss) Attributable to Parent, Total	(9,325,000)	$ (7,381,000)	$ (2,265,000)	$ (3,003,000)	(16,706,000)	$ (5,268,000)
Net Cash Provided by (Used in) Operating Activities, Total					(8,975,000)	$ (4,323,000)
Retained Earnings (Accumulated Deficit), Ending Balance	(138,940,000)				(138,940,000)				$ (122,234,000)
Restructuring Reserve, Accrual Adjustment					0
Employee Severance [Member]
Accrued Liabilities, Total	2,900,000				2,900,000		$ 4
Paycheck Protection Program CARES Act [Member]
Proceeds from Issuance of Long-term Debt, Total	$ 1,900,000				$ 1,900,000