Note 2 - Summary of Significant Accounting Policies - Goodwill and Intangible Assets (Details)	3 Months Ended
	Jun. 30, 2018 USD ($)
Intangible assets at December 31, 2017, net	$ 21,629,000
Intangible assets, amortization and foreign exchange (current year)	(83,000)
Intangible assets, impairment loss	(14,507,000)
Intangible assets at June 30, 2018, net	7,039,000
Goodwill at December 31, 2017, net	13,976,000
Goodwill, impairment loss	(12,695,000)
Goodwill at June 30, 2018, net	$ 1,281,000