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Consolidated Cash Flow Statements (Unaudited) - USD ($)
 9 Months Ended
Sep. 30, 2018
Oct. 01, 2017
Cash flows from operating activities:    
Net loss $ (3,317,000) $ (9,588,000)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 1,988,000 2,929,000
Stock-based compensation expense 493,000 563,000
Deferred loan costs recognized 11,000 45,000
Insurance recovery gain (2,275,000) 0
Net loss (gain) on the sale of assets 241,000 (2,664,000)
Provision for excess and obsolete inventory (125,000) 145,000
Other noncash items 127,000 622,000
Contributions to pension plans (77,000) 0
Changes in operating assets and liabilities:    
Accounts receivable (2,164,000) (2,552,000)
Inventory (2,184,000) (7,713,000)
Other current assets (2,681,000) 658,000
Accounts payable 4,007,000 5,617,000
Accrued and other liabilities 4,891,000 3,392,000
Net cash used in operating activities (1,065,000) (8,546,000)
Cash flows from investing activities:    
Capital expenditures (1,321,000) (1,457,000)
Proceeds from sale of assets 1,388,000 2,750,000
Insurance proceeds for recovery of property damage, net 2,275,000 0
Change in restricted cash 0 1,500,000
Net cash provided by investing activities 2,342,000 2,793,000
Cash flows from financing activities:    
Capital lease payments (691,000) (149,000)
Indirect repurchase of shares of minimum statutory tax withholdings (107,000) (123,000)
Net cash used in financing activities (798,000) (272,000)
Net increase (decrease) in cash and cash equivalents 479,000 (6,025,000)
Cash and cash equivalents at beginning of period 8,144,000 15,270,000
Cash and cash equivalents at end of period $ 8,623,000 $ 9,245,000