Revenue Recognition: Schedule Of Revenues By Product Category (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Sales, net	$ 10,732	$ 10,887
Obstetrics
Sales, net	1,339
Gynecology/Electrosurgery/Urology
Sales, net	5,582
Neonatal
Sales, net	1,510
Blood Pressure Monitoring and Accessories
Sales, net	2,301
DomesticUsMember
Sales, net	5,794
DomesticUsMember | Obstetrics
Sales, net	1,027
DomesticUsMember | Gynecology/Electrosurgery/Urology
Sales, net	2,078
DomesticUsMember | Neonatal
Sales, net	1,170
DomesticUsMember | Blood Pressure Monitoring and Accessories
Sales, net	1,519
OutsideUsMember
Sales, net	4,938
OutsideUsMember | Obstetrics
Sales, net	312
OutsideUsMember | Gynecology/Electrosurgery/Urology
Sales, net	3,504
OutsideUsMember | Neonatal
Sales, net	340
OutsideUsMember | Blood Pressure Monitoring and Accessories
Sales, net	$ 782