Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Cash flows from operating activities:
Net loss	$ (2,141,134)	$ (1,098,307)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Gain on sale of assets	(7,602)	(8,360)
Depreciation and amortization	1,463,443	1,504,037
Impairment of intangibles	0
Non-cash interest expense	94,392	62,120
Change in allowance for doubtful accounts	831	0
Share-based compensation expense	219,257	131,918
Changes in operating assets and liabilities:
Accounts receivable	172,719	269,444
Inventories	1,258,015	(348,121)
Prepaid expenses and other current and non-current assets	131,026	44,389
Accounts payable	(371,833)	(343,038)
Accrued expenses and other current liabilities	(83,367)	157,376
Contract liabilities	(555,329)	134,345
Net cash provided by operating activities	180,419	505,803
Cash flows from investing activities:
Purchases of property, plant and equipment	(169,131)	(801,884)
Proceeds from sale of property, plant and equipment	32,602	8,360
Proceeds from sale of assets held for sale	663,334	0
Cash paid for patents and trademarks	0	(2,661)
Net cash provided by (used in) investing activities	526,805	(796,185)
Cash flows from financing activities:
Payments on revolving line of credit, net	(751,293)	146,545
Payments on term notes payable	(457,143)	(419,047)
Payments of debt issuance costs	0	(42,389)
Proceeds from subordinated debt	500,000
(Payments on) subordinated debt		(350,000)
Net cash provided by (used in) financing activities	(708,436)	(664,891)
Net change in cash and cash equivalents	(1,212)	(955,273)
Cash and cash equivalents, beginning of period	1,715	956,988
Cash and cash equivalents, end of period	503	1,715
Supplemental Cash Flow Information
Cash paid for interest	353,343	313,425
Non-cash activities:
Issuance of common stock warrants in connection with subordinated notes payable	35,818
Issuance of treasury stock for directors' fees	110,541	75,750
Adjustment to accumulated deficit for change in accounting principle (ASC 606)	$ 0	$ (13,991)