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CONSOLIDATED CONDENSED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net earnings $ 10,491 $ 8,338
Adjustments to reconcile net earnings to net cash provided by operating activities -    
Depreciation 2,842 2,971
Amortization 238 265
Bad debt expense 190 350
Deferred income taxes 1,353 2,192
Net foreign currency transaction losses (gains) 332 (61)
Stock-based compensation 1,149 1,174
Pension contribution (3,000) (4,000)
Pension expense 522 746
Increase in cash surrender value of life insurance (250) (250)
Changes in operating assets and liabilities -    
Accounts receivable (7,557) (5,703)
Inventories 180 12,195
Prepaid expenses and other assets 2,756 3,167
Accounts payable (2,928) (6,838)
Accrued liabilities and other (4,749) 1,849
Accrued income taxes 278 22
Net cash provided by operating activities 1,847 16,417
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchase of marketable securities (7,819) (14,719)
Proceeds from maturities of marketable securities 7,450 10,710
Life insurance premiums paid (155) (155)
Purchases of property, plant and equipment (876) (1,406)
Net cash used for investing activities (1,400) (5,570)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Cash dividends paid (9,213) (8,877)
Cash dividends paid to noncontrolling interest of subsidiary (88) (204)
Payment to acquire noncontrolling interest of subsidiary (3,740) 0
Shares purchased and retired (6,589) (11,621)
Proceeds from stock options exercised 4,308 2,013
Taxes paid related to the net share settlement of equity awards (699) (51)
Proceeds from bank borrowings 20,309 20,651
Repayments of bank borrowings (12,261) (20,147)
Net cash used for financing activities (7,973) (18,236)
Effect of exchange rate changes on cash and cash equivalents (177) 383
Net decrease in cash and cash equivalents (7,703) (7,006)
CASH AND CASH EQUIVALENTS at beginning of period 23,453 13,710
CASH AND CASH EQUIVALENTS at end of period 15,750 6,704
SUPPLEMENTAL CASH FLOW INFORMATION:    
Income taxes paid, net of refunds 1,915 2,829
Interest paid $ 10 $ 7