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Consolidated Statements of Cash Flows - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Cash flows from operating activities:    
Net income (loss) $ 1,668,000 $ (3,949,000)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:    
Depreciation and amortization 2,503,000 2,671,000
Deferred income taxes (3,070,000) (260,000)
Non-cash compensation 426,000 469,000
Deferred loan costs amortized 14,000 11,000
Net gain on disposal or abandonment of assets (236,000) (654,000)
Provision for excess and obsolete inventory 222,000 616,000
Non-cash lease expense 911,000 650,000
Other noncash items (1,000) 52,000
Contributions to pension plans (862,000) (382,000)
Changes in operating assets and liabilities:    
Accounts receivable 214,000 2,425,000
Inventory 4,230,000 (2,621,000)
Prepaid expenses and other assets (204,000) 756,000
Accounts payable (2,591,000) (4,100,000)
Accrued and other liabilities 424,000 (1,537,000)
Net cash provided by (used in) operating activities 3,648,000 (5,853,000)
Cash flows from investing activities:    
Capital expenditures (1,542,000) (859,000)
Proceeds from sale of assets 1,969,000 1,858,000
Net cash provided by investing activities 427,000 999,000
Cash flows from financing activities:    
Principal payments on finance lease obligations (715,000) (632,000)
Proceeds from Paycheck Protection Program loan 3,558,000 0
Indirect repurchase of shares for minimum statutory tax withholdings (103,000) (156,000)
Net cash provided by (used in) financing activities 2,740,000 (788,000)
Effect of exchange rate changes on cash balances (304,000) 33,000
Net increase (decrease) in cash and cash equivalents 6,511,000 (5,609,000)
Cash and cash equivalents at beginning of year 5,095,000 10,704,000
Cash and cash equivalents at end of year 11,606,000 5,095,000
Supplemental disclosure of cash flow information:    
Right-of-use assets obtained in exchange for finance lease obligations $ 0 $ 269,000