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Consolidated Statements of Cash Flows - USD ($)
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Cash flows from operating activities:    
Net loss $ (4,312,000) $ (3,354,000)
Adjustments to reconcile net loss to net cash used in operating activities:    
Common stock issued for services 18,000 5,000
Share based compensation 691,000 238,000
Depreciation and amortization 92,000 108,000
Estimated losses on contracts 574,000 0
Gain on forgiveness of Payroll Protection Program loan (251,000) 0
Change in operating assets and liabilities:    
Contract assets (590,000) (28,000)
Prepaid expenses and other assets (81,000) (137,000)
Accounts payable and accrued liabilities 6,000 (144,000)
Accrued compensation and taxes 225,000 277,000
Contract liabilities (46,000) (2,000)
Net cash used in operating activities (3,674,000) (3,037,000)
Cash flows from investing activities:    
Acquisition of fixed assets (25,000) 0
Disbursements for patents and other intangible assets (69,000) (116,000)
Net cash used in investing activities (94,000) (116,000)
Cash flows from financing activities:    
Proceeds from issuance of common stock, net of offering costs 5,309,000 0
Proceeds from exercise of stock options and warrants 277,000 22,000
Proceeds from Payroll Protection Program loan   251,000
Net cash provided by financing activities 5,586,000 273,000
Net change in cash and cash equivalents 1,818,000 (2,880,000)
Cash and cash equivalents, beginning of period 8,824,000 8,552,000
Cash and cash equivalents, end of period $ 10,642,000 $ 5,672,000