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Condensed Consolidated Statements Of Cash Flows (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Cash flows from (used in) operating activities    
Net income $ 261 $ 212
Adjustments to reconcile net income to net cash from operating activities:    
Depreciation 32 28
Deferred income taxes (1) (7)
Change in allowance for doubtful accounts (1) 0
Interest accrued on investments 0 (3)
Change in:    
Trade receivables (62) (232)
Inventories 7 (155)
Other current assets 17 (2)
Accounts payable 79 96
Accrued expenses 76 133
Deferred revenue 0 (5)
Accrued income taxes 58 105
Net cash from operating activities 466 170
Cash flows from (used in) investing activities    
Purchase of treasury bills 0 (4,300)
Proceeds from the maturity of treasury bills 0 4,300
Purchase of property and equipment (42) (9)
Net cash used in investing activities (42) (9)
Cash flows from (used in) financing activities    
Proceeds from issuance of stock 4 18
Dividends paid (270) (272)
Net cash used in financing activities (266) (254)
Net increase (decrease) in cash and cash equivalents 158 (93)
Cash and cash equivalents, beginning 5,476 583
Cash and cash equivalents, ending 5,634 490
Supplemental schedule of non-cash investing and financing activities    
Net change in unrealized gain (loss) on investments (115) 561
Supplemental cash flow information    
Cash paid for income taxes $ 109 $ 52