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Consolidated Statements of Cash Flows - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Cash flows from operating activities:    
Net loss $ (3,505,000) $ (10,822,000)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:    
Depreciation and amortization 2,648,000 3,884,000
Deferred income taxes (509,000) (667,000)
Non-cash compensation 637,000 730,000
Deferred loan costs amortized 14,000 60,000
Insurance recovery gain (2,275,000) 0
Settlement gain (1,890,000) 0
Net loss (gain) on sale of assets 249,000 (2,668,000)
Provision for excess and obsolete inventory 520,000 116,000
Other noncash items 278,000 (32,000)
Contributions to pension plans (77,000) 0
Changes in operating assets and liabilities:    
Accounts receivable (612,000) (1,419,000)
Inventory (2,857,000) (3,204,000)
Prepaid expenses and other assets (1,163,000) 951,000
Accounts payable 2,948,000 3,491,000
Accrued and other liabilities 7,486,000 121,000
Net cash provided by (used in) operating activities 1,892,000 (9,459,000)
Cash flows from investing activities:    
Capital expenditures (2,051,000) (1,637,000)
Proceeds from sale of assets 1,380,000 2,801,000
Insurance proceeds for recovery of property damage, net 2,275,000 0
Net cash provided by investing activities 1,604,000 1,164,000
Cash flows from financing activities:    
Capital lease payments (829,000) (208,000)
Indirect repurchase of shares for minimum statutory tax withholdings (107,000) (123,000)
Net cash used in financing activities (936,000) (331,000)
Net increase (decrease) in cash and cash equivalents 2,560,000 (8,626,000)
Cash, cash equivalents and restricted cash at beginning of year 8,144,000 16,770,000
Cash and cash equivalents at end of year 10,704,000 8,144,000
Supplemental disclosure of cash flow information:    
Expenditures funded by capital lease borrowings $ 0 $ 1,277,000