Condensed Consolidated Balance Sheets (USD $)	Jun. 30, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 6,598,448	$ 11,387,300
Short-term investments	2,498,539	2,490,587
Accounts receivable, net of allowance	2,996,513	2,535,331
Inventories	3,611,185	3,276,568
Other current assets	428,623	299,620
Total current assets	16,133,308	19,989,406
Property and equipment:
Leasehold improvements	311,320	304,396
Equipment at customers	3,032,471	2,374,302
Machinery and equipment	5,323,918	5,034,300
Property and equipment, gross	8,667,709	7,712,998
Accumulated depreciation and amortization	(6,041,855)	(5,583,358)
Property and equipment, net	2,625,854	2,129,640
Intangible and other assets, net	683,180	704,648
Total assets	19,442,342	22,823,694
Current liabilities:
Accounts payable	1,537,809	1,340,488
Accrued expenses	1,050,195	1,443,367
Total current liabilities	2,588,004	2,783,855
Deferred gain on sale and leaseback of property	697,470	764,789
Income taxes payable	211,159	211,159
Total liabilities	3,496,633	3,759,803
Commitments and contingencies
Stockholders' equity:
Common stock, $.004 par value per share, 40,000,000 shares authorized, 13,739,996 and 13,701,273 shares issued at June 30, 2012 and December 31, 2011, respectively, including shares held in treasury	54,960	54,805
Common stock held in treasury, at cost - 86,000 shares	(101,480)	(101,480)
Additional paid-in capital	11,408,290	10,930,927
Accumulated deficit	(9,353,701)	(5,758,001)
Total stockholders' equity	15,945,709	19,063,891
Total liabilities and stockholders' equity	19,442,342	22,823,694
Series A Convertible Preferred Stock [Member]
Stockholders' equity:
Preferred stock	8,802,000	8,802,000
Series A Exchangeable Preferred Stock [Member]
Stockholders' equity:
Preferred stock	$ 5,135,640	$ 5,135,640