CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Cash flows from operating activities:
Net income	$ (1,599)	$ 3,308
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	266	263
Deferred pension costs	(206)	200
Bad debt expense	457	0
Provision for excess and obsolete inventory	0	427
Noncash lease expense	420	529
Other	95	167
Changes in operating assets and liabilities:
Accounts receivable	(2,171)	496
Lease receivable	263	247
Inventories	556	(449)
Operating lease right-of-use asset	(44)	0
Contract revenue in excess of billings	829	33
Prepaid expenses and other assets	324	(237)
Accounts payable	(284)	(140)
Accrued liabilities	155	147
Accrued pension and retirement liabilities	45	(428)
Billings in excess of contract revenue	(531)	(306)
Operating lease liability	(390)	(528)
Net cash provided by (used in) operating activities	(1,815)	3,729
Cash flows from investing activities:
Purchases of property and equipment	(131)	(136)
Proceeds from sale of property and equipment	7	35
Net cash used in investing activities	(124)	(101)
Cash flows from financing activities:
Proceeds for shares issued on exercise of options	21	0
Principal payments on long-term debt	(674)	(631)
Net cash used in financing activities	(653)	(631)
Net increase (decrease) in cash, cash equivalents, and restricted cash	(2,592)	2,997
Cash, cash equivalents, and restricted cash as of beginning of the year	8,585	5,588
Cash, cash equivalents, and restricted cash as of end of the year	5,993	8,585
Supplemental disclosures of non-cash investing and financing activities
New operating lease	2,698	0
Supplemental disclosures of cash flow information
Cash paid (received) during the period for (from): Interest	398	74
Cash paid (received) during the period for (from): Income taxes	$ (165)	$ 103