Condensed Consolidated Balance Sheets - USD ($)	Jun. 30, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 7,570,291	$ 7,528,292
Accounts receivable, net	3,044,230	2,921,720
Inventories	1,827,096	1,428,425
Other current assets	551,727	416,112
Assets associated with discontinued operations	990,135	1,239,344
Total current assets	13,983,479	13,533,893
Property and equipment:
Leasehold improvements	139,970	139,970
Equipment at customers	3,692,774	3,513,617
Machinery and equipment	4,929,681	4,753,062
Property and equipment, gross	8,762,425	8,406,649
Accumulated depreciation and amortization	(6,339,162)	(6,173,823)
Property and equipment, net	2,423,263	2,232,826
Intangible and other assets, net	784,587	813,017
Total assets	17,191,329	16,579,736
Current liabilities:
Accounts payable	1,366,584	1,459,798
Accrued expenses	1,689,010	1,833,502
Notes payable	162,363	82,377
Current portion of long-term debt, less unamortized debt issuance cost		2,616,992
Liabilities associated with discontinued operations	295,902	199,940
Total current liabilities	3,513,859	6,192,609
Deferred gain on sale and leaseback of property	158,921	226,240
Long-term debt, less current portion and unamortized debt issuance cost	7,277,550	4,207,629
Other long-term liability	320,000	300,000
Total liabilities	11,270,330	10,926,478
Commitments and contingencies
Stockholders' equity:
Common stock, $.004 par value per share, 60,000,000 shares authorized, 27,422,861 and 27,391,722 shares issued at June 30, 2016 and December 31, 2015, respectively, including shares held in treasury	109,691	109,567
Common stock held in treasury, at cost - 86,000 shares	(101,480)	(101,480)
Additional paid-in capital	30,159,202	29,636,087
Accumulated deficit	(38,184,054)	(37,928,556)
Total stockholders' equity	5,920,999	5,653,258
Total liabilities and stockholders' equity	17,191,329	16,579,736
Series A Convertible Preferred Stock [Member]
Stockholders' equity:
Preferred stock, $.001 par value per share, 1,000,000 shares authorized	8,802,000	8,802,000
Series A Exchangeable Preferred Stock [Member]
Stockholders' equity:
Preferred stock, $.001 par value per share, 1,000,000 shares authorized	$ 5,135,640	$ 5,135,640