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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Cash flows from operating activities:    
Net income $ 124 $ 955
Adjustments to reconcile net income to operating cash flow:    
Depreciation and amortization 754 807
Loss on sale of investments, net 0 12
Reserve for inventory obsolescence 50 0
Stock-based compensation 449 21
Loss on sale of property and equipment 5 0
(Increase) decrease in operating assets:    
Accounts receivable (2,576) (572)
Inventories 363 (1,337)
Refundable income taxes 0 (232)
Prepaid expenses and other current assets 87 (83)
Increase (decrease) in operating liabilities:    
Accounts payable 2,553 (946)
Accrued expenses 361 411
Accrued income taxes 80 (52)
Net cash provided by (used in) operating activities 2,250 (1,016)
Cash flows from investing activities:    
Purchases of investments 0 (373)
Proceeds from sale of investments 0 152
Redemption of certificates of deposit 0 363
Purchases of property and equipment (1,078) (336)
Proceeds from sale of property and equipment 34 0
Net cash used in investing activities (1,044) (194)
Cash flows from financing activities:    
Purchase of treasury stock 0 (440)
Repayment of notes payable (210) (210)
Net cash used in financing activities (210) (650)
Net increase (decrease) in cash and cash equivalents 996 (1,860)
Cash and cash equivalents at the beginning of the period 8,812 5,646
Cash and cash equivalents at the end of the period 9,808 3,786
Supplemental cash flow information:    
Cash paid for income taxes, net of refunds 0 886
Cash paid for interest $ 57 $ 58