Statements of Consolidated Cash Flows - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2021		Dec. 31, 2020		Dec. 31, 2019
OPERATING ACTIVITIES
Net income		$ 35,721		$ 29,761		$ 23,336
Adjustments to reconcile net income to net cash provided by operations:
Depreciation and amortization		15,564		13,838		13,748
Provision for accounts receivable allowances		2,895		2,053		2,132
Provision for inventory reserves		3,052		2,035		1,283
Deferred income taxes		6,544		(3,380)		(1,274)
Share-based compensation expense		4,163		4,089		4,396
(Gain) loss on sale of property and equipment		(184)		1,108		10
Other - net		656		6		292
Changes in operating assets and liabilities assets:
Accounts receivable		(11,576)		(10,539)		(9,777)
Inventories		(24,154)		80		(9,455)
Prepaid expenses		(2,974)		(8,786)		(932)
Trade accounts payables and accrued liabilities		11,558		6,952		6,087
Accrued income and other taxes		(4,332)		3,470		634
Contributions to company pension plan		0		(330)		0
Other - net		(3,335)		1,285		(3,263)
NET CASH PROVIDED BY OPERATING ACTIVITIES		33,598		41,642		27,217
INVESTING ACTIVITIES
Capital expenditures		(18,384)		(24,569)		(29,467)
Proceeds from the sale of property and equipment		141		10,525		54
Purchase of marketable securities		0		0		(496)
Proceeds from sale of marketable securities		0		0		2,309
Purchase of company owned life insurance policies		0		0		(2,309)
Acquisition of businesses, net of cash		0		0		(18,894)
NET CASH USED IN INVESTING ACTIVITIES		(18,243)		(14,044)		(48,803)
FINANCING ACTIVITIES
Increase (decrease) in notes payable to banks		376		9,465		(355)
Proceeds from long-term debt		98,919		90,847		93,036
Payments of long-term debt		(113,537)		(110,083)		(64,124)
Dividends paid		(4,128)		(4,184)		(4,230)
Proceeds from issuance of common shares		409		252		213
Purchase of common shares for treasury		(177)		(5,836)		(2,800)
Purchase of common shares for treasury from related parties		(5,092)		(3,626)		(4,026)
NET CASH (USED IN) PROVIDED BY FINANCING ACTIVITIES		(23,230)		(23,165)		17,714
Effects of exchange rate changes on cash and cash equivalents		(894)		1,479		(775)
Net (decrease) increase in cash, cash equivalents and restricted cash		(8,769)		5,912		(4,647)
Cash, cash equivalents and restricted cash at beginning of year		45,175	[1]	39,263	[1]	43,910
CASH, CASH EQUIVALENTS AND RESTRICTED CASH AT END OF YEAR	[1]	$ 36,406		$ 45,175		$ 39,263

[1] Non-cash investing and financing activities: The Company purchased a new corporate aircraft during the year ended December 31, 2021 with a term loan in the principal amount of $20.5 million. For further information regarding this transaction, refer to Note E, “Debt and Credit Arrangements.”