Consolidated Balance Sheets - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Current assets:
Cash	$ 218,132	$ 76,194
Accounts receivable - net	978,408	1,573,600
Inventories	880,660	962,783
Prepaid expenses	784,650	688,259
Total current assets	2,861,850	3,300,836
Property and equipment:
Equipment	2,899,611	2,872,494
Leasehold improvements	1,187,100	1,180,050
Construction and equipment in progress	374,525	119,340
Total	4,461,236	4,171,884
Less accumulated depreciation and amortization	1,689,520	1,399,435
Net property and equipment	2,771,716	2,772,449
Deferred tax asset	3,900,221	4,817,309
Deferred contract costs	817,763	698,935
Goodwill	278,466	278,466
Operating lease right of use assets	4,242,416	0
Other assets including long-term portion of notes receivable - net	4,232,655	3,808,957
Total assets	19,105,087	15,676,952
Current liabilities:
Current portion of long-term notes payable to bank	871,429	871,429
Accounts payable and accrued expenses	731,059	523,315
Current portion of operating lease liability	333,763	0
Total current liabilities	1,936,251	1,394,744
Long-term obligations:
Term loans payable to bank (net of current portion)	2,999,275	3,898,733
Convertible notes payable	1,501,282	1,539,204
Operating lease liabilities	4,016,728	0
Deferred contract income	817,763	698,935
Total long-term liabilities	9,335,048	6,136,872
Stockholders' equity:
Common stock - no par value (40,000,000 shares authorized, 21,783,131 issued and outstanding as of December 31, 2018 and 22,215,512 issued and outstanding as of December 31, 2019)	24,858,311	24,739,482
Accumulated deficit	(17,024,523)	(16,594,146)
Total stockholders' equity	7,833,788	8,145,336
Total liabilities and stockholders' equity	$ 19,105,087	$ 15,676,952