Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Cash flows provided by operating activities
Net income	$ 253	$ 1,967
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization	1,363	1,166
Share-based compensation	843	721
Bad debt expense	(26)	0
Loss on disposal of fixed assets	4	0
Loss from discontinued operations, net of tax	1,436	0
Deferred taxes	(10)	0
Change in assets and liabilities
Accounts receivable	(139)	713
Contract assets	(508)	(721)
Inventory	(937)	(161)
Other current assets	(404)	(18)
Accounts payable and accrued expenses	(1,286)	(2,314)
Contract liabilities	(520)	(235)
Net cash provided by operating activities	69	1,118
Cash flows provided by/(used in) investing activities
Acquisition of property and equipment	(111)	(406)
Intangible property costs	(192)	(137)
Proceeds from sale of property and equipment	1	0
Proceeds from sale of discontinued operations	600	0
Acquisition of General Photonics Corporation	0	(19,004)
Net cash provided by/(used in) investing activities	298	(19,547)
Cash flows provided by/(used in) financing activities
Payments on finance lease obligations	(26)	(15)
Payments of debt obligations	0	(625)
Repurchase of common stock	(204)	(220)
Proceeds from the exercise of options and warrants	1,363	367
Net cash provided by/(used in) financing activities	1,133	(493)
Net increase/(decrease) in cash and cash equivalents	1,500	(18,922)
Cash and cash equivalents—beginning of period	25,006	42,460
Cash and cash equivalents—end of period	26,506	23,538
Supplemental disclosure of cash flow information
Cash paid for interest	2	13
Cash paid for income taxes	29	687
Non-cash investing and financing activities
Contingent liability for business combination	0	915
Dividend on preferred stock, 39,646 shares of common stock issuable for the six months ended June 30, 2019	$ 0	$ 173