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Consolidated Cash Flow Statements (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Cash flows from operating activities:    
Net loss $ (2,305) $ (1,795)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 691 672
Stock-based compensation expense 111 143
Deferred loan costs recognized 4 3
Gain on the sale of assets 0 (281)
Provision for excess and obsolete inventory 37 (75)
Other noncash items (127) 68
Contributions to pension plans (10) (11)
Changes in operating assets and liabilities:    
Accounts receivable 758 (675)
Inventory (2,664) 78
Other current assets 398 (667)
Accounts payable (1,801) 1,047
Accrued and other liabilities 436 847
Net cash used in operating activities (4,472) (646)
Cash flows from investing activities:    
Capital expenditures, net (348) (406)
Proceeds from sale of assets 0 363
Net cash used in investing activities (348) (43)
Cash flows from financing activities:    
Principal payments on finance lease obligations (146) (425)
Indirect repurchase of shares of minimum statutory tax withholdings (49) 0
Net cash used in financing activities (195) (425)
Net decrease in cash and cash equivalents (5,015) (1,114)
Cash and cash equivalents at beginning of period 10,704 8,144
Cash and cash equivalents at end of period 5,689 7,030
Supplemental disclosure of cash flow information:    
Right-of-use assets obtained in exchange for finance lease obligations $ 269 $ 0