Note 4 - Intangible Assets and Goodwill - Goodwill and Intangible Assets (Details)	12 Months Ended
	Dec. 31, 2018 USD ($)
Intangible assets at December 31, 2017, net	$ 21,629,000
Goodwill at December 31, 2017, net	13,976,000
Intangible assets, amortization and foreign exchange (current year)	(152,000)
Goodwill, foreign exchange (current year)
Intangible assets, impairment loss	(19,886,000)
Goodwill, impairment loss	(13,195,000)
Intangible assets at September 30, 2018, net	1,591,000
Goodwill at September 30, 2018, net	$ 781,000