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Consolidated Statements of Cash Flows (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Cash flows from operating activities:    
Net (loss) income $ (9,887,000) $ 3,047,000
Loss from discontinued operations 0 (7,220,000)
(Loss) income from continuing operations (9,887,000) 10,267,000
Adjustments to reconcile net (loss) income to net cash used in operating activities:    
Depreciation and amortization 12,401,000 12,251,000
Deferred income taxes (1,286,000) 871,000
Gain on sale of marketable securities 0 (1,850,000)
Non-cash compensation 1,689,000 1,826,000
Deferred revenue recognized (8,000,000) (7,892,000)
Deferred loan costs recognized 78,000 78,000
Write-off of pre-contract costs 0 1,113,000
Gain on sale of assets (1,516,000) (2,590,000)
Provision for excess and obsolete inventory 1,251,000 928,000
Goodwill impairment 6,900,000 0
Other noncash items 565,000 1,209,000
Contributions to pension plans (663,000) (1,598,000)
Changes in operating assets and liabilities:    
Accounts receivable (19,000) 4,307,000
Inventory (1,708,000) (1,191,000)
Prepaid expenses and other assets (556,000) (1,350,000)
Accounts payable 705,000 (15,193,000)
Accrued and other liabilities (247,000) (6,106,000)
Net cash used in operating activities (293,000) (4,920,000)
Cash flows from investing activities:    
Capital expenditures (5,053,000) (7,082,000)
Proceeds from sale of marketable securities 0 1,914,000
Proceeds from sale of assets 2,265,000 4,595,000
Net cash used in investing activities (2,788,000) (573,000)
Cash flows from financing activities:    
Net change in debt under Credit Facility 5,000,000 9,000,000
Common stock repurchases (36,000) (660,000)
Indirect repurchase of shares for minimum statutory tax withholdings (657,000) (750,000)
Cash dividends paid (1,216,000) (1,607,000)
Proceeds from issuance of common stock 0 1,000
Net cash provided by financing activities 3,091,000 5,984,000
Net increase in cash and cash equivalents 10,000 491,000
Cash and cash equivalents at beginning of year 18,664,000 18,173,000
Cash and cash equivalents at end of year $ 18,674,000 $ 18,664,000