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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Cash flows from operating activities:    
Net income $ 1,160 $ 3,062
Adjustments to reconcile net income to operating cash flow:    
Depreciation and amortization 1,519 1,617
Loss on sale of investments, net 0 27
Reserve for inventory obsolescence 131 0
Stock-based compensation 775 42
Loss on sale of property and equipment 5 151
(Increase) decrease in operating assets:    
Accounts receivable (793) (502)
Inventories (185) (1,649)
Refundable income taxes (33) (70)
Prepaid expenses and other current assets (500) (448)
Increase (decrease) in operating liabilities:    
Accounts payable 564 (1,710)
Accrued expenses 1,259 765
Accrued income taxes (579) 576
Net cash provided by operating activities 3,323 1,861
Cash flows from investing activities:    
Purchases of investments 0 (479)
Proceeds from sale of investments 0 1,024
Redemption of certificates of deposit 0 513
Purchases of property and equipment (2,400) (1,382)
Proceeds from sale of property and equipment 34 39
Net cash used in investing activities (2,366) (285)
Cash flows from financing activities:    
Purchase of treasury stock 0 (738)
Repayment of notes payable (420) (420)
Net cash used in financing activities (420) (1,158)
Net increase in cash and cash equivalents 537 418
Cash and cash equivalents at the beginning of the period 8,812 5,646
Cash and cash equivalents at the end of the period 9,349 6,064
Supplemental cash flow information:    
Cash paid for income taxes, net of refunds 1,493 886
Cash paid for interest $ 118 $ 105