Statements of Cash Flows (Unaudited) - USD ($)	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Operating activities:
Net loss	$ (699,000)	$ (499,000)
Adjustment to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	366,000	371,000
Stock compensation expense	94,000	107,000
Changes in assets and liabilities related to operations:
Trade accounts receivable	(1,202,000)	(936,000)
Other accounts receivable		1,000
Inventories	415,000	122,000
Prepaid expenses and other assets	80,000	(50,000)
Accounts payable	201,000	125,000
Accrued expenses	(4,000)	20,000
Net cash used in operating activities	(749,000)	(739,000)
Investing activities:
Acquisition of equipment and leasehold improvements	(184,000)	(102,000)
Payment of accounts payable incurred for the purchase of equipment and leasehold improvements	(8,000)	(12,000)
Net cash used in investing activities	(192,000)	(114,000)
Financing activities:
Principal payments on capital leases	(41,000)	(15,000)
Proceeds from line of credit	250,000
Proceeds from exercise of stock options	26,000	0
Net cash provided by (used in) financing activities	235,000	(15,000)
Decrease in cash and cash equivalents	(706,000)	(868,000)
Cash and cash equivalents at beginning of period	1,862,000	3,276,000
Cash and cash equivalents at end of period	1,156,000	2,408,000
Supplemental cash flow information:
Interest paid	6,000	3,000
Supplemental non-cash investing activities:
Accounts payable incurred for the purchase of equipment and leasehold improvements	65,000	$ 25,000
Capital lease obligations incurred in the purchase of equipment	$ 65,000