Consolidated Balance Sheets - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Current assets:
Cash	$ 76,194	$ 461,068
Accounts receivable - net	1,573,600	1,796,757
Inventories	962,783	779,989
Prepaid expenses	688,259	680,326
Total current assets	3,300,836	3,718,140
Property and equipment:
Equipment	2,872,494	2,533,848
Leasehold improvements	1,180,050	581,197
Construction and equipment in progress	119,340	558,602
Total	4,171,884	3,673,647
Less accumulated depreciation and amortization	1,399,435	1,372,821
Net property and equipment	2,772,449	2,300,826
Deferred tax asset (net of current portion)	4,817,309	5,735,504
Deferred contract costs	698,935	0
Goodwill	278,466	278,466
Other assets including long-term portion of notes receivable - net	3,808,957	6,851,697
Total assets	15,676,952	18,884,633
Current liabilities:
Current portion of long-term notes payable to bank	871,429	754,173
Accounts payable and accrued expenses	523,315	674,600
Total current liabilities	1,394,744	1,428,773
Long-term obligations:
Term loans payable to bank (net of current portion)	3,898,733	4,246,375
Convertible notes payable	1,539,204	1,131,982
Deferred contract income	698,935	0
Derivative warrant liability	0	503,851
Derivative conversion liability	0	925,561
Total long-term liabilities	6,136,872	6,807,769
Stockholders' equity:
Common stock - no par value (40,000,000 shares authorized,20,783,032 issued and outstanding as of December 31, 2017 and 21,583,032 issued and outstanding as of December 31, 2018)	24,739,482	24,322,885
Accumulated deficit	(16,594,146)	(13,674,794)
Total stockholders' equity	8,145,336	10,648,091
Total liabilities and stockholders' equity	$ 15,676,952	$ 18,884,633