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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Cash flows from operating activities:    
Net income $ 2,998 $ 1,645
Adjustments to reconcile net income to operating cash flow:    
Depreciation and amortization 2,326 2,346
Loss on sale of investments, net 15 21
Impairment of investments 0 385
Deferred income taxes 444 (472)
Reserve for inventory obsolescence 89
Stock based compensation 100
Loss (Gain) on sale of property and equipment 307 (243)
(Increase) decrease in operating assets:    
Accounts receivable (823) (540)
Inventories (1,611) (1,118)
Refundable income taxes (72) 1,011
Prepaid expenses and other current assets (310) 252
Increase (decrease) in operating liabilities:    
Accounts payable 370 (396)
Accrued expenses 465 1,038
Accrued income taxes 215 449
Net cash provided by operating activities 4,513 4,378
Cash flows from investing activities:    
Purchases of investments (559) (1,369)
Proceeds from sale of investments 2,751 1,230
Redemption of certificates of deposit 513 250
Investments in certificates of deposit (635)
Purchases of property and equipment (2,481) (1,619)
Proceeds from sale of property and equipment 149 343
Net cash provided by (used in) investing activities 373 (1,800)
Cash flows from financing activities:    
Purchase of treasury stock (738)
Repayment of notes payable (630) (827)
Net cash used in financing activities (1,368) (827)
Net increase in cash and cash equivalents 3,518 1,751
Cash and cash equivalents at the beginning of the period 5,646 3,260
Cash and cash equivalents at the end of the period 9,164 5,011
Supplemental cash flow information:    
Cash paid for income taxes, net of refunds 886 795
Cash paid for interest $ 162 $ 178