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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Cash flow from operating activities:      
Net income (loss) $ (12,835) $ 5,689 $ 3,910
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:      
Impairment charge 5,524 505 0
Depreciation and amortization 3,653 3,897 3,414
Recovery of doubtful accounts 0 0 (423)
Stock-based compensation 935 977 815
Deferred income taxes 4,617 (762) (767)
Pension cost 519 668 501
Changes in operating assets and liabilities:      
Accounts receivable 2,441 7,389 (12,894)
Prepaid expenses and other current assets 393 548 (13)
Other assets (507) (722) (668)
Accounts payable (999) 9 1,044
Accrued salaries, wages and related benefits (1,937) (12) 1,726
Restricted shares withheld for taxes (31) 0 0
Income and other taxes (1,152) (421) 375
Net cash provided by (used in) operating activities 621 17,765 (2,980)
Cash flows from investing activities:      
Capital expenditures (3,780) (6,845) (5,886)
Sale (purchase) of investments 3,091 2,737 8,047
Net cash provided by (used in) investing activities (689) (4,108) 2,161
Cash flows from financing activities:      
Proceeds from exercise of stock options 72 574 0
Payment of long-term obligations (677) (195) (585)
Purchase of treasury stock 0 0 (1,327)
Net cash provided by (used in) financing activities (605) 379 (1,912)
Increase (decrease) in cash and cash equivalents (673) 14,036 (2,731)
Cash and cash equivalents, beginning of year 25,425 11,389 14,120
Cash and cash equivalents, end of year 24,752 25,425 11,389
Supplemental disclosures of cash flow information:      
Cash paid for income taxes $ 1,568 $ 1,794 $ 1,079