Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Other Comprehensive Income [Line Items]
Accumulated other comprehensive income (loss)	$ (4,785,000)	$ (5,588,000)	$ (4,173,000)	$ (4,547,000)
Foreign currency translation adjustments	589,000	(1,857,000)	84,000
Unrealized gain (loss) on available-for-sale securities	95,000	(245,000)
Amounts reclassified from accumulated other comprehensive income (loss)	272,000	111,000	201,000
Tax effect	(76,000)	23,000	(52,000)
Unrecognized amounts from defined benefit pension plans	(103,000)	705,000	110,000
Tax effect	26,000	(152,000)	31,000
Net of tax amount	803,000	(1,415,000)	374,000
Foreign currency translation adjustments [Member]
Other Comprehensive Income [Line Items]
Accumulated other comprehensive income (loss)	(4,922,000)	(5,511,000)	(3,654,000)	(3,738,000)
Unrealized gain (loss) on available-for-sale securities	0	0
Amounts reclassified from accumulated other comprehensive income (loss)	0	0	0
Tax effect	0	0	0
Unrecognized amounts from defined benefit pension plans	0	0	0
Tax effect	0	0	0
Net of tax amount	589,000	(1,857,000)	84,000
Defined benefit pension plans [Member]
Other Comprehensive Income [Line Items]
Accumulated other comprehensive income (loss)	45,000	122,000	(519,000)	(809,000)
Foreign currency translation adjustments	0	0	0
Unrealized gain (loss) on available-for-sale securities	0	0
Amounts reclassified from accumulated other comprehensive income (loss)	0	119,000	201,000
Tax effect	0	(31,000)	(52,000)
Unrecognized amounts from defined benefit pension plans	(103,000)	705,000	110,000
Tax effect	26,000	(152,000)	31,000
Net of tax amount	(77,000)	641,000	290,000
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent
Other Comprehensive Income [Line Items]
Accumulated other comprehensive income (loss)	92,000	(199,000)	0	$ 0
Foreign currency translation adjustments	0	0	0
Unrealized gain (loss) on available-for-sale securities	(95,000)	245,000
Amounts reclassified from accumulated other comprehensive income (loss)	272,000	(8,000)	0
Tax effect	(76,000)	54,000	0
Unrecognized amounts from defined benefit pension plans	0	0	0
Tax effect	0	0	0
Net of tax amount	$ 291,000	$ (199,000)	$ 0