Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Cash flows from operating activities:
Net income	$ 29,851	$ 25,188	$ 35,815
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	11,914	12,692	13,749
Pension expense	4,989	7,489	2,823
Contributions to pension plan	(2,000)	(2,000)	0
Deferred income tax charge (benefit)	50	544	(1,198)
Stock based compensation	2,396	42	1,025
Other	(103)	11	(53)
Changes in operating assets and liabilities, net of effects of acquisitions:
Accounts receivable, net	(8,702)	15,247	2,218
Inventories, net	(4,290)	(5,310)	11,452
Accounts payable	8,717	(6,845)	(601)
Commissions payable	2,718	(1,565)	(2,140)
Deferred revenue and customer deposits	1,351	2,953	(321)
Accrued expenses and other	(1,631)	5,162	102
Income taxes	178	(2,446)	(697)
Net cash provided by operating activities	45,438	51,162	62,174
Cash flows from investing activities:
Capital additions	(9,751)	(7,999)	(10,912)
Purchase of short-term investments, net	(4)	(4)	(4)
Other	586	299	69
Net cash used for investing activities	(9,169)	(7,704)	(10,847)
Regular cash dividends	(16,586)	(15,394)	(14,370)
Treasury share repurchases	(1,245)	(361)	(2,610)
Other	(722)	(381)	(383)
Net cash used for financing activities	(18,553)	(16,136)	(17,363)
Effect of exchange rate changes on cash	(725)	326	133
Net increase (decrease) in cash and cash equivalents	16,991	27,648	34,097
Cash and cash equivalents:
Beginning of year	108,203	80,555	46,458
End of period	$ 125,194	$ 108,203	$ 80,555