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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Cash flows from operating activities:    
Net loss $ (3,467) $ (3,453)
Adjustments to reconcile net loss from operations to net cash used in operating activities:    
Stock-based compensation 862 143
Amortization 16 20
Depreciation 171 102
Changes in assets and liabilities:    
Accounts receivable (862) (23)
Cost, estimated earnings and billings, net on uncompleted contracts 296 0
Accounts payable 29 (137)
Other assets and liabilities (161) (800)
Income taxes payable 0 (190)
Net cash used in operating activities (3,116) (4,338)
Cash flows from investing activities:    
Sale of available-for-sale investments 0 2,625
Maturities of held-to-maturity securities 2,592 1,494
Purchases of property and equipment (24) (638)
Net cash provided by investing activities 2,568 3,481
Cash flows from financing activities:    
Payments for shares bought back (308) (117)
Net cash used in financing activities (308) (117)
Net change in cash and cash equivalents (856) (974)
Cash and cash equivalents at beginning of period 4,399 2,330
Cash and cash equivalents at end of period 3,543 1,356
Supplemental disclosures of cash flow information:    
Cash paid for interest 0 0
Income taxes paid $ 0 $ 198