Condensed Consolidated Statements of Cash Flows - USD ($)	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Cash flows from operating activities:
Net loss	$ (809,890)	$ (322,035)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Gain on sale of property, plant and equipment	(21,554)
Depreciation and amortization	803,217	745,440
Non-cash interest expense	16,753	13,842
Changes in allowance for doubtful accounts	12,000	(30,000)
Share-based compensation expense	32,417	30,591
Changes in operating assets and liabilities:
Accounts receivable	(1,176,664)	106,330
Insurance receivable		(258,842)
Inventories	(194,180)	(554,983)
Prepaid expenses and other current assets	4,159	36,855
Other non-current assets	145,603	52,602
Accounts payable	866,811	185,567
Accrued expenses and other current liabilities	117,361	83,922
Customer deposits	88,175	298,627
Deferred revenue, current	(51,266)	(19,156)
Other non-current liabilities	(156,953)	(29,510)
Net cash provided by (used in) operating activities	(324,011)	339,250
Cash flows from investing activities:
Purchases of property, plant and equipment	(759,546)	(960,144)
Proceeds from sale of property, plant and equipment	23,200
Cash paid for patents and trademarks	(15,296)
Net cash provided by (used in) investing activities	(751,642)	(960,144)
Cash flows from financing activities:
Proceeds from (payments on) revolving line of credit, net	884,205	570,000
Proceeds from equipment line of credit	402,281	544,851
Payments on term notes payable	(253,145)	(291,104)
Proceeds from stock option exercises		51,150
Net cash provided by (used in) financing activities	1,033,341	874,897
Net increase (decrease) in cash and cash equivalents	(42,312)	254,003
Cash and cash equivalents, beginning of period	380,381	272,291
Cash and cash equivalents, end of period	338,069	526,294
Supplemental Cash Flow Information
Cash paid for interest	138,279	113,112
Non-cash activities:
Issuance of Treasury Stock for Directors Fees	$ 11,250
Equipment line of credit converted to term notes payable		$ 881,701