Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
CASH FLOWS FROM OPERATING ACTIVITIES
Net earnings	$ 1,861,000	$ 3,439,000
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	754,000	879,000
Provision for excess and obsolete inventory	342,000	344,000
Foreign exchange loss	33,000	44,000
Amortization of deferred compensation related to restricted stock	119,000	134,000
Loss on sale of property and equipment	15,000	44,000
Proceeds from sale of demonstration equipment, net of gain	214,000	161,000
Deferred income tax expense	168,000	318,000
Changes in assets and liabilities:
Trade accounts receivable	570,000	610,000
Inventories	(113,000)	(893,000)
Prepaid expenses and other current assets	$ (174,000)	(113,000)
Restricted certificates of deposit		100,000
Other assets	$ (15,000)	(17,000)
Accounts payable	(324,000)	172,000
Accrued wages and benefits	(36,000)	(75,000)
Accrued rent	42,000	38,000
Accrued professional fees	(25,000)	25,000
Accrued sales commissions	(31,000)	23,000
Other current liabilities	98,000	(104,000)
Net cash provided by operating activities	3,498,000	5,129,000
CASH FLOWS FROM INVESTING ACTIVITIES
Purchase of property and equipment	$ (599,000)	(831,000)
Proceeds from sale of property and equipment		8,000
Net cash used in investing activities	$ (599,000)	$ (823,000)
CASH FLOWS FROM FINANCING ACTIVITIES
Repurchases of common stock	(155,000)
Net cash used in financing activities	(155,000)
Effects of exchange rates on cash	(160,000)	$ (198,000)
Net cash provided by all activities	2,584,000	4,108,000
Cash and cash equivalents at beginning of period	23,126,000	19,018,000
Cash and cash equivalents at end of period	25,710,000	23,126,000
Cash payments for:
Domestic and foreign income taxes	$ 792,000	1,213,000
SUPPLEMENTAL DISCLOSURE OF NON-CASH INVESTING AND FINANCING ACTIVITIES:
Issuance of unvested shares of restricted stock		41,000
Forfeiture of unvested shares of restricted stock	$ (20,000)	$ (20,000)