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Consolidated Statements Of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Cash flows from (used in) operating activities    
Net income (loss) $ (89) $ 553
Adjustments to reconcile net income (loss) to net cash used in operating activities:    
Depreciation and amortization 79 88
Realized gain on sale of available-for-sale securities 0 (815)
Deferred income taxes (15) 40
Stock-based compensation expense 29 16
Other (11) (3)
Change in:    
Trade receivables (118) (186)
Inventories 69 (122)
Current assets, other 3 (16)
Accounts payable 19 101
Accrued expenses 0 5
Accrued income taxes (36) 140
Net cash used in operating activities (70) (199)
Cash flows from (used in) investing activities    
Proceeds from sale of available-for-sale securities 0 825
Purchase of treasury bills (1,447) (2,499)
Proceeds from the maturity of treasury bills 1,843 2,700
Purchase of property and equipment 0 (5)
Net cash from investing activities 396 1,021
Cash flows used in financing activities    
Payments on long-term debt (390) (381)
Net cash used in financing activities (390) (381)
Net increase (decrease) in cash and cash equivalents (64) 441
Cash and cash equivalents, beginning 569 1,190
Cash and cash equivalents, ending 505 1,631
Supplemental cash flow information    
Cash paid for income taxes 5 116
Cash paid for interest $ 10 $ 19