STATEMENTS OF CASH FLOWS - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 907,869	$ 6,091
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and accretion	450,180	460,637
Amortization	2,763	9,439
Stock based compensation	149,399	201,574
Loss on disposal of equipment	669	0
Inventory reserve	(26,259)	(11,640)
Changes in operating assets and liabilities:
Accounts receivable	(141,923)	(64,177)
Inventories	(2,109,142)	(229,243)
Prepaid expenses	(475,250)	(78,972)
Other assets	(25,511)	(1,458)
Accounts payable	13,850	155,741
Accrued expenses and customer deposits	2,906,442	167,967
Net cash provided by operating activities	1,653,087	615,959
CASH FLOWS FROM INVESTING ACTIVITIES
Purchases of property and equipment	(380,933)	(104,029)
Net cash used in investing activities	(380,933)	(104,029)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from exercise of stock options	9,765	0
Principal payments on capital lease obligations and notes payable	(375,730)	(321,480)
Payment of cumulative dividends on preferred stock	(24,152)	0
Net cash used in financing activities	(390,117)	(321,480)
NET INCREASE IN CASH	882,037	190,450
CASH - Beginning of year	920,802	730,352
CASH - End of year	1,802,839	920,802
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION
Interest	22,931	41,615
Income taxes	17,642	1,921
SUPPLEMENTAL DISCLOSURES OF NONCASH INVESTING AND FINANCING ACTIVITIES
Property and equipment purchased by capital lease	105,325	103,550
Increase in asset retirement obligation	$ 2,431	$ 1,218