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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Operating activities    
Net income (loss) $ (3,626) $ 2,689
Adjustments to reconcile net income (loss) to net cash (used in) provided by operating activities:    
Allowance for doubtful accounts 0 17
Inventory allowance 149 180
Deferred tax expense (1,163) 1,118
Depreciation and amortization 942 942
Share-based compensation expense 55 49
Restricted stock unit compensation expense 76 0
Realized tax benefit from stock option exercise 0 392
Gain on sale of available-for-sale securities (1,833) 0
Loss on disposal of property, plant and equipment 95 0
Changes in operating assets and liabilities:    
Trade accounts receivable (2,076) 657
Inventories (508) 2,103
Prepaid expenses and other current assets 637 1,671
Other assets (20) (3)
Accounts payable 3,998 (312)
Accrued compensation and related taxes (829) 1,057
Accrued warranty expense 739 112
Deferred revenue 88 48
Accrued other expenses and other current liabilities 990 1
Net cash (used in) provided by operating activities (2,286) 10,721
Investing activities    
Purchases of property, plant and equipment (628) (1,394)
Purchase of available-for-sale securities 0 (481)
Proceeds from sale of available-for-sale securities 2,642 0
Net cash used in investing activities 2,014 (1,875)
Financing activities    
Dividends paid (3,026) (2,473)
Repurchase of common stock (648) (162)
Proceeds from issuance of common stock 183 30
Net cash used in financing activities (3,491) (2,605)
(Decrease) increase in cash (3,763) 6,241
Cash and cash equivalents, beginning of year 10,910 4,669
Cash and cash equivalents, end of year 7,147 10,910
Supplemental disclosure    
Cash paid for income taxes 0 50
Non-cash financing activity    
Cashless exercise of stock options and related conversion of net shares to stockholders’ equity $ 27 $ 4