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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Cash flows from operating activities:    
Net income $ 648 $ 654
Adjustments to reconcile net income to operating cash flow:    
Depreciation and amortization 807 770
Loss on sale of investments, net 12 5
Impairment of investments $ 0 180
Deferred income taxes $ (196)
Stock based compensation $ 21
Gain on sale of equipment $ (36)
(Increase) decrease in operating assets:    
Accounts receivable $ (584) (33)
Inventories (627) (513)
Refundable income taxes (427) 1,050
Prepaid expenses and other current assets (71) 180
Increase (decrease) in operating liabilities:    
Accounts payable (1,054) (1,464)
Accrued expenses 311 1,395
Income taxes payable (52) 145
Net cash (used in) provided by operating activities (1,016) 2,137
Cash flows from investing activities:    
Purchases of investments (373) (1,005)
Proceeds from sale of investments 152 693
Redemption of certificates of deposit $ 363 100
Investments in certificates of deposit (85)
Purchases of property and equipment $ (336) (1,040)
Proceeds from sale of equipment 36
Net cash used in investing activities $ (194) $ (1,301)
Cash flows from financing activities:    
Purchase of treasury stock (440)
Repayment of notes payable (210) $ (271)
Net cash used in financing activities (650) (271)
Net increase (decrease) in cash and cash equivalents (1,860) 565
Cash and cash equivalents at the beginning of the period 5,646 3,260
Cash and cash equivalents at the end of the period 3,786 3,825
Supplemental cash flow information:    
Cash paid for income taxes, net of refunds 886 40
Cash paid for interest $ 58 $ 65