Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Net loss	$ (1,190)	$ (1,957)	$ (3,003)
Available-for-sale securities:
Changes in unrealized income (loss)	1,494	(465)	(158)
Reclassification adjustments for losses included in net income (loss)	73	41	50
Net change	1,567	(424)	(108)
Cash flow hedges:
Changes in unrealized gains (losses)	108	(19)	163
Reclassification adjustments for (gains) losses included in net income (loss)	(105)	16	(172)
Net change	3	(3)	(9)
Change in unrealized components of defined benefit plans:
Gains (losses) arising during the period	(141)	29	24
Amortization of actuarial loss and prior service benefit	16	19	22
Net change	(125)	48	46
Foreign currency translation adjustments, net	(10)	(71)	49
Other comprehensive income (loss)	1,435	(450)	(22)
Comprehensive income (loss)	$ 245	$ (2,407)	$ (3,025)