STATEMENTS OF CASH FLOWS (USD $)	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 210,761	$ 169,949
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	196,000	210,275
Amortization	1,438	1,438
Deferred income taxes	170,406	120,589
Stock-based compensation	16,321	18,017
Loss on disposal of fixed assets	37	287
Changes in:
Receivables	53,672	(6,268)
Inventory	76,228	191
Prepaid expenses and other assets	(16,903)	(99,114)
Accrued expenses	30,208	(74,380)
Accounts payable	(52,715)	(13,921)
Deferred revenue	250,000	(8,250)
Net cash provided by operating activities	935,453	318,813
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchase of property, plant and equipment	(83,410)	(236,953)
Maturities of short-term investments	1,494,000	1,692,000
Purchases of short-term investments	(2,490,000)	(1,494,000)
Net cash used for investing activities	(1,079,410)	(38,953)
CASH FLOWS FROM FINANCING ACTIVITIES:
Debt principal repayments	(89,535)	(85,250)
Proceeds from exercise of stock options	0	50,800
Tax benefits related to stock options	0	6,842
Net cash used for financing activities	(89,535)	(27,608)
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	(233,492)	252,252
BEGINNING CASH AND CASH EQUIVALENTS	2,673,719	781,516
ENDING CASH AND CASH EQUIVALENTS	2,440,227	1,033,768
INCOME TAXES PAID	0	(38,871)
INTEREST EXPENSE PAID	(34,495)	(378)
NON-CASH ACTIVITIES:
Change in capital expenditures included in accounts payable	(4,550)	(23,506)
Net change in fair value of interest rate swap	$ (24,225)	$ 8,220