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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
CASH FLOWS FROM OPERATING ACTIVITIES:      
Net earnings $ 20,399 $ 16,441 $ 14,126
Adjustments to reconcile net earnings to net cash provided by operating activities -      
Depreciation 3,338 2,591 2,700
Amortization 305 253 116
Bad debt expense 175 316 35
Deferred income taxes 1,648 (343) 503
Net gains on remeasurement of contingent consideration (3,522) (206) 0
Net foreign currency transaction losses (gains) 138 197 (400)
Stock-based compensation 1,201 1,224 1,128
Pension contributions 0 (1,600) (1,500)
Pension expense 3,407 2,836 3,248
Net gains on sale of marketable securities 0 (346) 0
Net losses (gains) on disposal of property, plant and equipment 63 (14) 16
Impairment of property, plant and equipment 93 165 310
Increase in cash surrender value of life insurance (535) (527) (515)
Changes in operating assets and liabilities, net of effects from acquisitions -      
Accounts receivable (5,586) (1,267) (4,642)
Inventories (2,676) (3,667) (14,889)
Prepaids and other assets 368 (752) (681)
Accounts payable (1,802) 2,141 1,031
Accrued liabilities and other 1,293 633 654
Accrued income taxes (320) (932) (1,142)
Net cash provided by operating activities 17,987 17,143 98
CASH FLOWS FROM INVESTING ACTIVITIES:      
Acquisition of businesses, net of cash acquired 0 (27,023) (2,638)
Purchase of marketable securities (10) (1,179) (22,762)
Proceeds from maturities and sales of marketable securities 7,342 12,963 6,375
Proceeds from the sale of property, plant and equipment 0 14 0
Life insurance premiums paid (155) (155) (155)
Purchase of property, plant and equipment (9,540) (8,189) (1,510)
Net cash used for investing activities (2,363) (23,569) (20,690)
CASH FLOWS FROM FINANCING ACTIVITIES:      
Cash dividends paid (10,875) (7,155) (7,026)
Cash dividends paid to noncontrolling interest of subsidiary (233) 0 0
Shares purchased and retired (6,558) (13,021) (2,321)
Proceeds from stock options exercised 2,300 1,096 1,202
Payment of indemnification holdback (2,000) 0 0
Repayment of debt assumed in acquisition 0 (3,814) 0
Net (repayments) borrowings of commercial paper 0 (5,000) 5,000
Proceeds from bank borrowings 33,000 73,000 0
Repayments of bank borrowings (25,000) (36,000) 0
Income tax benefits from stock-based compensation 655 496 555
Net cash (used for) provided by financing activities (8,711) 9,602 (2,590)
Effect of exchange rate changes on cash and cash equivalents 46 3 332
Net increase (decrease) in cash and cash equivalents 6,959 3,179 (22,850)
CASH AND CASH EQUIVALENTS at beginning of year 10,329 7,150 30,000
CASH AND CASH EQUIVALENTS at end of year 17,288 10,329 7,150
SUPPLEMENTAL CASH FLOW INFORMATION:      
Income taxes paid, net of refunds 8,946 7,989 8,472
Interest paid $ 442 $ 457 $ 118