Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Cash flows from operating activities:
Net loss	$ (499)	$ (17,836)
Adjustments to reconcile net loss to cash provided by (used in) operating activities:
Depreciation	2,156	2,154
Amortization of intangible assets	1,432	1,474
Non-cash operating lease expense	15	39
Noncash adjustment of cylinder deposits		(502)
Lower of cost or net realizable value reserve	(2,163)	1,991
Allowance for doubtful accounts	427	(507)
Stock compensation expense	333	628
Amortization of deferred finance costs	526	618
Deferred tax (benefit) expense	46	143
Changes in assets and liabilities:
Trade accounts receivable	(17,683)	(13,478)
Inventories	12,831	24,724
Prepaid and other assets	805	(1,749)
Accounts payable and accrued expenses	4,338	(789)
Cash provided by (used in) operating activities	2,564	(3,090)
Cash flows from investing activities:
Additions to property, plant, and equipment	(590)	(279)
Cash used in investing activities	(590)	(279)
Cash flows from financing activities:
Proceeds from issuance of common stock		9
Borrowing of short-term debt - net	1,931	4,000
Borrowing - Paycheck Protection Program	2,475	0
Repayment of long-term debt	(1,130)	(1,610)
Cash provided by financing activities	3,276	2,399
Increase (decrease) in cash and cash equivalents	5,250	(970)
Cash and cash equivalents at beginning of period	2,600	2,272
Cash and cash equivalents at end of period	7,850	1,302
Supplemental Disclosure of Cash Flow Information:
Cash paid during period for interest	5,997	7,894
Cash (refund) paid for income taxes- net	$ (58)	$ 8