CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Cash flows from operating activities
Net income (loss)	$ 833,000	$ (648,000)
Adjustments to reconcile net income (loss) to net cash used in operating activities:
Bad debt expense	0	25,000
Depreciation and amortization	1,042,000	1,135,000
Share-based compensation expense	23,000	59,000
Gain on sale of assets	0	(28,000)
Gain from insurance proceeds	(487,000)	0
Amortization of loan fees included in interest expense	71,000.0	64,000
Change in assets and liabilities
Receivables	(2,042,000)	(1,610,000)
Receivables from related parties	44,000	105,000
Inventories	(2,883,000)	(694,000)
Income tax receivable/payable	8,000	10,000
Other assets	(188,000)	(154,000)
Accounts payable	1,638,000	(42,000)
Payables and accrued expenses to related parties	(167,000)	(240,000)
Other current liabilities	(224,000)	(13,000)
Net cash used in operating activities	(2,332,000)	(2,031,000)
Cash flows from investing activities
Proceeds from insurance claim, net	487,000	0
Proceeds from sale of property and equipment	0	28,000
Purchases of property and equipment	(104,000)	(75,000)
Net cash from (used in) investing activities	383,000	(47,000)
Cash flows from financing activities
Loan fees capitalized	(109,100)	(125,000)
Change in checks in excess of bank	194,000	(65,000)
Payments on related party debt	(32,000)	0
Payments on capital lease obligations	(148,000)	(63,000)
Proceeds from revolving line of credit, net	1,894,000	2,705,000
Net cash from financing activities	1,799,000	2,452,000
Net change in cash and cash equivalents	(150,000)	374,000
Cash and cash equivalents at beginning of period	841,000	526,000
Cash and cash equivalents at end of period	691,000	900,000
Supplemental disclosure of cash flow information:
Cash paid for interest	435,000	296,000
Cash paid for taxes	14,000	2,000
Tax refunds received	1,000	5,000
Supplemental disclosure of noncash investing and financing activities:
Equipment additions financed by debt	69,000	0
Equipment additions financed by capital lease obligations	54,000	37,000
Equipment additions financed by related party debt	$ 0	$ 129,000