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Consolidated Cash Flow Statements (Unaudited) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2019
Sep. 29, 2019
Sep. 30, 2018
Cash flows from operating activities:        
Net loss $ (2,336,000) $ (3,090,000) $ (3,090,000) $ (3,317,000)
Adjustments to reconcile net loss to net cash used in operating activities:        
Depreciation and amortization   2,106,000   1,988,000
Stock-based compensation expense   389,000   493,000
Deferred loan costs recognized   11,000   11,000
Net (gain) loss on the sale of assets   (467,000)   241,000
Insurance recovery gain   0   (2,275,000)
Provision for excess and obsolete inventory   503,000   (125,000)
Non-cash lease expense   541,000   0
Other noncash items   (122,000)   127,000
Contributions to pension plans   (348,000)   (77,000)
Changes in operating assets and liabilities:        
Accounts receivable   1,198,000   (2,164,000)
Inventory   (2,485,000)   (2,184,000)
Other current assets   23,000   (2,681,000)
Accounts payable   (3,314,000)   4,007,000
Accrued and other liabilities   1,908,000   4,891,000
Net cash used in operating activities   (3,147,000)   (1,065,000)
Cash flows from investing activities:        
Capital expenditures   (553,000)   (1,321,000)
Proceeds from sale of assets   653,000   1,388,000
Insurance proceeds for recovery of property damage, net   0   2,275,000
Net cash provided by investing activities   100,000   2,342,000
Cash flows from financing activities:        
Principal payments on finance lease obligations   (466,000) (466,000) (691,000)
Indirect repurchase of shares of minimum statutory tax withholdings   (138,000)   (107,000)
Net cash used in financing activities   (604,000)   (798,000)
Net (decrease) increase in cash and cash equivalents   (3,651,000)   479,000
Cash and cash equivalents at beginning of period   10,704,000 $ 10,704,000 8,144,000
Cash and cash equivalents at end of period $ 8,623,000 7,053,000   8,623,000
Supplemental disclosure of cash flow information:        
Right-of-use assets obtained in exchange for finance lease obligations   $ 269,000   $ 0