Revenue Recognition: Schedule Of Revenues By Product Category (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Sales, net	$ 10,887	$ 10,259
Obstetrics
Sales, net	1,086
Gynecology/Electrosurgery/Urology
Sales, net	6,201
Neonatal
Sales, net	1,710
Blood Pressure Monitoring and Accessories
Sales, net	1,890
Domestic US
Sales, net	5,254
Domestic US | Obstetrics
Sales, net	877
Domestic US | Gynecology/Electrosurgery/Urology
Sales, net	2,293
Domestic US | Neonatal
Sales, net	965
Domestic US | Blood Pressure Monitoring and Accessories
Sales, net	1,119
Outside US
Sales, net	5,633
Outside US | Obstetrics
Sales, net	209
Outside US | Gynecology/Electrosurgery/Urology
Sales, net	3,908
Outside US | Neonatal
Sales, net	745
Outside US | Blood Pressure Monitoring and Accessories
Sales, net	$ 771