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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Cash flows from operating activities:      
Net income $ 1,972 $ 1,956 $ 4,990
Adjustments to reconcile net income to operating cash flow:      
Depreciation and amortization 3,129 3,252 2,339
Loss (Gain) on sale of investments, net 72 $ (99) $ (196)
Impairment of investments 475
Deferred income taxes (585) $ (720) $ 239
Bad Debt expense 73 205 33
(Gain) Loss on sale of equipment (253) (7) 305
(Increase) decrease in operating assets:      
Accounts receivable 537 55 (1,742)
Other receivables 59 (31) (94)
Inventories (1,849) 1,085 (960)
Refundable income taxes 691 (126) (930)
Prepaid expenses and other current assets 95 (124) (6)
Increase (decrease) in operating liabilities:      
Accounts payable 1,551 (1,136) 2,466
Accrued expenses 726 $ 782 128
Income taxes payable 52 (254)
Net cash provided by operating activities 6,745 $ 5,092 5,841
Cash flows from investing activities:      
Purchases of investments (1,489) (3,280) (3,519)
Proceeds from sale of investments 1,714 2,774 3,001
Redemption of certificates of deposit 272 15 $ 424
Investments in certificates of deposit (635) (150)
Purchases of property and equipment (1,995) (3,684) $ (8,480)
Proceeds from sale of equipment 353 65 711
Net cash used in investing activities (1,780) $ (4,261) $ (7,863)
Cash flows from financing activities:      
Purchase of treasury stock $ (1,542)
Dividends paid $ (1,308)
Net proceeds from debt issuance 4,975
Repayment of notes payable $ (1,037) $ (877) (625)
Net cash provided by (used in) financing activities (2,579) (877) 3,042
Net increase (decrease) in cash and cash equivalents 2,386 (46) 1,020
Cash and cash equivalents at the beginning of the period 3,260 3,306 2,286
Cash and cash equivalents at the end of the period 5,646 3,260 3,306
Supplemental cash flow information:      
Cash paid for income taxes 2,245 3,080 4,363
Cash paid for interest $ 235 $ 267 $ 206