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Condensed Consolidated Statements Of Cash Flows (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Cash flows from (used in) operating activities    
Net income $ 540 $ 405
Adjustments to reconcile net income to net cash from (used in) operating activities:    
Depreciation 82 48
Gain on sales of available-for-sale securities (530) 0
Deferred income taxes (21) 2
Interest accrued on investments (4) 0
Stock compensation expense 149 6
Change in allowance for doubtful accounts (2) (1)
Change in:    
Trade receivables (126) 61
Inventories 70 (154)
Other current assets (83) (12)
Accounts payable 2 96
Accrued expenses 147 145
Accrued income taxes (289) 85
Net cash from (used in) operating activities (65) 681
Cash flows from (used in) investing activities    
Proceeds from sale of available-for-sale securities 536 0
Purchase of treasury bills (5,426) 0
Proceeds from the maturity of treasury bills 5,251 0
Purchase of property and equipment (18) (50)
Net cash from (used in) investing activities 343 (50)
Cash flows from (used in) financing activities    
Proceeds from issuance of common stock 8 8
Dividends paid (272) (407)
Net cash used in financing activities (264) (399)
Net increase in cash and cash equivalents 14 232
Cash and cash equivalents, beginning 1,102 5,476
Cash and cash equivalents, ending 1,116 5,708
Supplemental schedule of non-cash investing and financing activities    
Net change in unrealized gain (loss) on available-for-sale securities (639) 263
Supplemental cash flow information    
Cash paid for income taxes $ 524 $ 158