Statements of Cash Flows (USD $)	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Operating activities:
Net loss	$ (1,083,307)	$ (1,272,080)
Adjustment to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	563,764	587,166
Stock compensation expense	201,130	242,840
Allowance for excess inventory quantities		2,728
Changes in assets and liabilities related to operations:
Trade accounts receivable	(774,091)	(840,497)
Other accounts receivable	(63,342)	455,550
Inventories	(92,315)	(24,805)
Prepaid expenses and other assets	(154,425)	(43,790)
Accounts payable	(240,242)	500,835
Accrued expenses	(530,654)	238,281
Net cash used in operating activities	(2,173,482)	(153,772)
Investing activities:
Acquisition of equipment and leasehold improvements	(52,141)	(81,191)
Payment of accounts payable incurred for the purchase of equipment and leasehold improvements	(52,444)	(10,873)
Purchases of investments		(3,999,502)
Sales of investments		7,564,106
Net cash (used in) provided by investing activities	(104,585)	3,472,540
Financing activities:
Principal payment on debt obligations, including capital leases	(748)	(4,137)
Net cash used in financing activities	(748)	(4,137)
(Decrease) increase in cash and cash equivalents	(2,278,815)	3,314,631
Cash and cash equivalents at beginning of period	5,744,322	3,899,393
Cash and cash equivalents at end of period	3,465,507	7,214,024
Supplemental cash flow information:
Interest paid	1,798	1,253
Supplemental non-cash investing activities:
Accounts payable incurred for the purchase of equipment and leasehold improvements	$ 19,144	$ 42,224