Condensed Consolidated Statements of Changes in Stockholders' Equity - USD ($)		Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Treasury Stock, Common [Member]	Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common Stock, Shares, Outstanding		8,955,930
Common Stock Outstanding, $1 Par Value		$ 9,006,000
Capital in Excess of Par Value		15,623,000
Retained Earnings		77,338,000
Treasury Stock		(1,234,000)
Accumulated Other Comprehensive Income (Loss)		(1,560,000)
Total Stockholders' Equity		99,173,000
Net income		4,146,000			$ 4,146,000
Adjustment for foreign currency translation		675,000					$ 675,000
Stock-based compensation		$ 666,000		$ 666,000
Shares issued (in shares)		6,520
Shares issued		$ 0	$ 6,000	(6,000)
Net income		5,453,000
Adjustment for foreign currency translation		$ 1,392,000
Common Stock, Shares, Outstanding		8,962,450
Common Stock Outstanding, $1 Par Value		$ 9,012,000
Capital in Excess of Par Value		16,283,000
Retained Earnings		83,421,000
Treasury Stock		(1,234,000)
Accumulated Other Comprehensive Income (Loss)		(885,000)
Total Stockholders' Equity		106,597,000
Change in accounting principle	[1]	1,937,000			1,937,000
Net income		1,307,000			1,307,000
Adjustment for foreign currency translation		717,000					717,000
Stock-based compensation		$ 711,000		711,000
Shares issued (in shares)		20,712
Shares issued		$ 0	21,000	(21,000)
Common Stock, Shares, Outstanding		8,983,162
Common Stock Outstanding, $1 Par Value		$ 9,033,000
Capital in Excess of Par Value		16,973,000
Retained Earnings		84,728,000
Treasury Stock		(1,234,000)
Accumulated Other Comprehensive Income (Loss)		(168,000)
Total Stockholders' Equity		109,332,000
Common Stock Outstanding, $1 Par Value		9,190,000
Capital in Excess of Par Value		18,077,000
Retained Earnings		86,496,000
Treasury Stock		(5,761,000)
Accumulated Other Comprehensive Income (Loss)		(1,000)
Total Stockholders' Equity		108,001,000
Net income		$ 12,533,000			12,533,000
Treasury shares repurchased (in shares)		(47,504)
Treasury shares repurchased		$ (1,756,000)				$ (1,756,000)
Adjustment for foreign currency translation		(2,494,000)					(2,494,000)
Stock-based compensation		451,000		451,000
Net income		$ 13,152,000
Treasury shares repurchased (in shares)		(47,504)
Adjustment for foreign currency translation		$ (1,316,000)
Common Stock, Shares, Outstanding		8,996,267
Common Stock Outstanding, $1 Par Value		$ 9,190,000
Capital in Excess of Par Value		18,528,000
Retained Earnings		99,029,000
Treasury Stock		(7,517,000)
Accumulated Other Comprehensive Income (Loss)		(2,495,000)
Total Stockholders' Equity		116,735,000
Net income		619,000			$ 619,000
Adjustment for foreign currency translation		1,178,000					$ 1,178,000
Stock-based compensation		$ 498,000		498,000
Shares issued (in shares)		11,144
Shares issued		$ 14,000	$ 11,000	$ 3,000
Common Stock, Shares, Outstanding		9,007,411
Common Stock Outstanding, $1 Par Value		$ 9,201,000
Capital in Excess of Par Value		19,029,000
Retained Earnings		99,648,000
Treasury Stock		(7,517,000)
Accumulated Other Comprehensive Income (Loss)		(1,317,000)
Total Stockholders' Equity		$ 119,044,000

[1] The Company adopted the ASC No.842, Leases (ASC 842) on January 1, 2019 using the modified retrospective approach. See Note 7 - Leases for further details.