Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Net income	$ (1,891)	$ 484	$ (5,434)	$ (1,103)
Available-for-sale securities:
Changes in unrealized gains (losses)	(50)	142	332	1,492
Reclassification adjustments for losses (gains) included in net income (loss)	(27)	7	(39)	50
Net change	(77)	149	293	1,542
Change in unrealized components of defined benefit plans:
Amortization of actuarial loss and prior service benefit	6	4	18	12
Foreign currency translation adjustments, net	(63)	19	(110)	(7)
Other comprehensive income (loss)	(134)	172	201	1,550
Comprehensive income (loss)	(2,025)	656	(5,233)	447
Net income	$ (1,891)	$ 484	(5,434)	(1,103)
Cash flow hedges:
Changes in unrealized gains			52	108
Reclassification adjustments for gains included in net loss			(52)	(105)
Net change			$ 0	$ 3