Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Cash flows from operating activities:
Net loss	$ (6,143)	$ (6,121)
Adjustments to reconcile net loss from operations to net cash used in operating activities:
Stock-based compensation	242	954
Amortization	7	8
Depreciation	386	344
Net loss on sale of available-for-sale investments	34	60
Changes in assets and liabilities:
Accounts receivable	136	(595)
Cost, estimated earnings and billings, net on uncompleted contracts	0	451
Accounts payable	26	(46)
Other assets and liabilities	(537)	168
Net cash used in operating activities	(5,849)	(4,777)
Cash flows from investing activities:
Sale of available-for-sale investments	3,615	3,744
Maturities of available-for-sale securities	700	3,090
Purchases of property and equipment	(14)	(241)
Net cash provided by investing activities	4,301	6,593
Cash flows from financing activities:
Payments for purchase of treasury stock	(3)	(1,283)
Net cash used in financing activities	(3)	(1,283)
Net change in cash and cash equivalents	(1,551)	533
Cash and cash equivalents at beginning of period	2,184	4,399
Cash and cash equivalents at end of period	633	4,932
Supplemental disclosures of cash flow information:
Cash paid for interest	0	0
Income taxes paid	$ 0	$ 0