Consolidated Balance Sheets - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Current assets:
Cash	$ 2,317,659	$ 4,188,623
Restricted cash	130,326	256,005
Accounts receivable, net of $50,000 allowance for doubtful accounts	2,217,877	2,025,284
Inventory	1,563,593	1,651,246
Prepaid expenses and other current assets	285,580	261,324
Total current assets	6,515,035	8,382,482
Property, plant and equipment, net	5,014,494	4,805,640
Investment	324,930	484,930
Other assets	90,319	83,376
Goodwill	2,453,597	2,453,597
Other intangible assets, net	881,411	1,220,752
Total assets	15,279,786	17,430,777
Current liabilities:
Accounts payable	1,347,491	728,652
Accrued expenses and deferred revenue	1,106,346	989,154
Other current liabilities	2,255,942	2,953,629
Short-term debt		3,645,760
Current portion of long-term debt, net	713,427	966,506
Total current liabilities	5,423,206	9,283,701
Long-term debt, net	1,721,936	1,734,171
Other long-term liabilities	391,325	1,501,064
Deferred tax liability, net	168,986	125,982
Commitments and contingencies (Note 12)
Stockholders' equity
Common stock, $.02 par value; 200,000,000 shares authorized, 17,425,858 shares issued and outstanding (16,599,327 on December 31, 2017)	348,517	331,987
Additional paid-in capital	107,624,666	106,633,708
Subscription receivable, net		(300,000)
Accumulated other comprehensive loss	(7,052)	(23,069)
Accumulated deficit	(100,391,798)	(101,856,767)
Total stockholders' equity	7,574,333	4,785,859
Total liabilities and stockholders' equity	$ 15,279,786	$ 17,430,777