7. Recent Accounting Pronouncements (Details 1) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenue from External Customer [Line Items]
Revenues	$ 38,847	$ 36,164	$ 78,248	$ 74,669
Fluid Delivery [Member]
Revenue from External Customer [Line Items]
Revenues	18,128	15,630	36,928	33,636
Cardiovascular [Member]
Revenue from External Customer [Line Items]
Revenues	13,003	12,222	26,213	23,686
Ophthalmology [Member]
Revenue from External Customer [Line Items]
Revenues	2,852	3,762	5,637	7,435
Other Products [Member]
Revenue from External Customer [Line Items]
Revenues	$ 4,864	$ 4,550	$ 9,470	$ 9,912