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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Cash flows from operating activities:    
Net income $ 1,403 $ 2,998
Adjustments to reconcile net income to operating cash flow:    
Depreciation and amortization 2,305 2,326
Loss on sale of investments, net 0 15
Reserve for inventory obsolescence 320 89
Stock-based compensation 901 100
Deferred income taxes 0 444
Loss on sale of property and equipment 39 307
(Increase) decrease in operating assets:    
Accounts receivable (814) (823)
Inventories (328) (1,611)
Refundable income taxes (462) (72)
Prepaid expenses and other current assets (231) (310)
Increase (decrease) in operating liabilities:    
Accounts payable 1,384 370
Accrued expenses 252 465
Accrued income taxes (580) 215
Net cash provided by operating activities 4,189 4,513
Cash flows from investing activities:    
Purchases of investments (25) (559)
Proceeds from sale of investments 0 2,751
Redemption of certificates of deposit 0 513
Purchases of property and equipment (3,932) (2,481)
Proceeds from sale of property and equipment 37 149
Net cash (used in) provided by investing activities (3,920) 373
Cash flows from financing activities:    
Purchase of treasury stock (1,187) (738)
Repayment of notes payable (630) (630)
Net cash used in financing activities (1,817) (1,368)
Net (decrease) increase in cash and cash equivalents (1,548) 3,518
Cash and cash equivalents at the beginning of the period 8,812 5,646
Cash and cash equivalents at the end of the period 7,264 9,164
Supplemental cash flow information:    
Cash paid for income taxes, net of refunds 2,098 886
Cash paid for interest $ 180 $ 162