Note 9 - Acquired Intangible Assets, Net - Summary of Intangible Assets (Details) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Gross Value	$ 28,206,000
Accumulated Currency Translation Adjustment	(4,752,000)		$ (4,576,000)
Impairment	(281,000)
Accumulated Amortization	(14,706,000)		(14,439,000)
Intangible assets, net	8,467,000		9,191,000
In Process Research and Development [Member]
Gross Value	4,406,000
Accumulated Currency Translation Adjustment	(1,232,000)		(1,168,000)
Intangible assets, net	3,174,000		3,238,000
Developed Technology Rights [Member]
Gross Value	17,100,000
Accumulated Currency Translation Adjustment	(2,929,000)		(2,824,000)
Impairment	(281,000)
Accumulated Amortization	(8,927,000)		(8,672,000)
Intangible assets, net	$ 4,963,000		5,604,000
Useful life (Year)	15 years
Distribution Rights [Member]
Gross Value	$ 4,700,000
Accumulated Currency Translation Adjustment	(415,000)		(415,000)
Accumulated Amortization	(4,285,000)		(4,285,000)
Intangible assets, net
Useful life (Year)	5 years
Patents [Member]
Gross Value	$ 1,000,000
Accumulated Currency Translation Adjustment	(176,000)		(169,000)
Accumulated Amortization	(494,000)		(482,000)
Intangible assets, net	$ 330,000		349,000
Useful life (Year)	16 years
Elevess Trade Name [Member]
Gross Value	$ 1,000,000
Accumulated Currency Translation Adjustment
Accumulated Amortization	(1,000,000)		(1,000,000)
Intangible assets, net
Useful life (Year)	9 years