Condensed Consolidated Statements of Changes in Stockholders' Equity - USD ($)	Total	Retained Earnings [Member]	Treasury Stock, Common [Member]	Accumulated Foreign Currency Adjustment Attributable to Parent [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]
Common Stock, Shares, Outstanding	8,888,028
Common Stock Outstanding, $1 Par Value	$ 8,921,000
Capital in Excess of Par Value	13,005,000
Retained Earnings	71,453,000
Treasury Stock	(711,000)
Accumulated Other Comprehensive Income (Loss)	822,000
Total Stockholders' Equity	93,490,000
Net income	1,236,000	$ 1,236,000
Adjustment for foreign currency translation	(1,483,000)			$ (1,483,000)
Stock-based compensation	$ 651,000					$ 651,000
Shares Issued	307
Shares Issued, Par Value	$ 0				$ 1,000	(1,000)
Net income	3,614,000
Adjustment for foreign currency translation	$ (769,000)
Common Stock, Shares, Outstanding	8,888,335
Common Stock Outstanding, $1 Par Value	$ 8,922,000
Capital in Excess of Par Value	13,655,000
Retained Earnings	72,360,000
Treasury Stock	(711,000)
Accumulated Other Comprehensive Income (Loss)	(661,000)
Total Stockholders' Equity	93,565,000
Change in accounting principle	(329,000)	(329,000)
Net income	3,194,000	3,194,000
Adjustment for foreign currency translation	22,000			22,000
Stock-based compensation	$ 673,000					673,000
Shares Issued	30,304
Shares Issued, Par Value	$ 0				30,000	(30,000)
Common Stock, Shares, Outstanding	8,918,639
Common Stock Outstanding, $1 Par Value	$ 8,952,000
Capital in Excess of Par Value	14,298,000
Retained Earnings	75,554,000
Treasury Stock	(711,000)
Accumulated Other Comprehensive Income (Loss)	(639,000)
Total Stockholders' Equity	97,454,000
Net income	(816,000)	(816,000)
Adjustment for foreign currency translation	692,000			692,000
Stock-based compensation	$ 692,000					692,000
Shares Issued	1,005
Shares Issued, Par Value	$ 0				1,000	(1,000)
Common Stock, Shares, Outstanding	8,919,644
Common Stock Outstanding, $1 Par Value	$ 8,953,000
Capital in Excess of Par Value	14,989,000
Retained Earnings	74,738,000
Treasury Stock	(711,000)
Accumulated Other Comprehensive Income (Loss)	53,000
Total Stockholders' Equity	$ 98,022,000
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, Par Value	6,520
Shares Issued, Par Value	$ 0				6,000	(6,000)
Net income	$ 10,227,000
Treasury Stock, Value, Acquired, Cost Method	32,362
Adjustment for foreign currency translation	$ 965,000
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	1,937,000	1,900,000
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, Par Value	20,712
Shares Issued, Par Value	$ 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
Net income	$ 4,774,000	$ 4,774,000
Treasury Stock, Value, Acquired, Cost Method	(35,830)
Treasury Stock, Value, Acquired, Cost Method	$ (1,361,000)		$ (1,361,000)
Adjustment for foreign currency translation	(427,000)			$ (427,000)
Stock-based compensation	$ 663,000					663,000
Shares issued, Par Value	9,649
Shares Issued, Par Value	$ 0				$ 10,000	$ (10,000)
Common Stock, Shares, Outstanding	8,956,981
Common Stock Outstanding, $1 Par Value	$ 9,043,000
Capital in Excess of Par Value	17,626,000
Retained Earnings	89,502,000
Treasury Stock	(2,595,000)
Accumulated Other Comprehensive Income (Loss)	(595,000)
Total Stockholders' Equity	$ 112,981,000