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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   $ 654
Adjustments to reconcile net income to operating cash flow:    
Depreciation and amortization   770
Loss on sale of investments, net   5
Impairment of investments   180
Deferred income taxes   (196)
Stock based compensation  
Gain on sale of equipment   (36)
(Increase) decrease in operating assets:    
Accounts receivable   (33)
Inventories   (513)
Refundable income taxes   1,050
Prepaid expenses and other current assets   180
Increase (decrease) in operating liabilities:    
Accounts payable   (1,464)
Accrued expenses   1,395
Income taxes payable   145
Net cash (used in) provided by operating activities   2,137
Cash flows from investing activities:    
Purchases of investments   (1,005)
Proceeds from sale of investments   693
Redemption of certificates of deposit   100
Investments in certificates of deposit   (85)
Purchases of property and equipment   (1,040)
Proceeds from sale of equipment   36
Net cash used in investing activities   (1,301)
Cash flows from financing activities:    
Purchase of treasury stock  
Repayment of notes payable   (271)
Net cash used in financing activities   (271)
Net increase (decrease) in cash and cash equivalents   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   3,825
Supplemental cash flow information:    
Cash paid for income taxes, net of refunds   40
Cash paid for interest   $ 65
Restated [Member]    
Cash flows from operating activities:    
Net income 955  
Adjustments to reconcile net income to operating cash flow:    
Depreciation and amortization 807  
Loss on sale of investments, net 12  
Impairment of investments  
Deferred income taxes  
Stock based compensation 21  
Gain on sale of equipment  
(Increase) decrease in operating assets:    
Accounts receivable (584)  
Inventories (1,337)  
Refundable income taxes (232)  
Prepaid expenses and other current assets (71)  
Increase (decrease) in operating liabilities:    
Accounts payable (946)  
Accrued expenses 411  
Income taxes payable (52)  
Net cash (used in) provided by operating activities (1,016)  
Cash flows from investing activities:    
Purchases of investments (373)  
Proceeds from sale of investments 152  
Redemption of certificates of deposit 363  
Investments in certificates of deposit  
Purchases of property and equipment (336)  
Proceeds from sale of equipment  
Net cash used in investing activities (194)  
Cash flows from financing activities:    
Purchase of treasury stock (440)  
Repayment of notes payable (210)  
Net cash used in financing activities (650)  
Net increase (decrease) in cash and cash equivalents (1,860)  
Cash and cash equivalents at the beginning of the period 5,646  
Cash and cash equivalents at the end of the period 3,786  
Supplemental cash flow information:    
Cash paid for income taxes, net of refunds 886  
Cash paid for interest $ 58