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Consolidated Statements of Cash Flows - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
OPERATING ACTIVITIES:    
Net income (loss) $ 473,000 $ (1,249,000)
Adjustments to reconcile net income (loss) to net cash used for operating activities:    
Depreciation and amortization 330,000 248,000
Stock-based compensation expense 52,000 31,000
Gain on sale of long-term investment (1,838,000)
Non-cash investment expense 103,000 750,000
Non-cash interest income (16,000)
Equity in loss of affiliate company 39,000 43,000
Loss on disposal of property and equipment 2,000 1,000
Changes in operating assets and liabilities:    
Accounts receivable, net 121,000 (367,000)
Other current assets (1,213,000) (562,000)
Other long term assets (72,000) (42,000)
Accounts payable 20,000 223,000
Accrued payroll 80,000 20,000
Deferred revenue, current portion (621,000) (356,000)
Accrued expenses 55,000 18,000
Other current liabilities 70,000 95,000
Deferred revenue, net of current portion (34,000) (110,000)
Other long-term liabilities (18,000)
Net cash used for operating activities (2,467,000) (1,257,000)
INVESTING ACTIVITIES:    
Purchases of property and equipment (894,000) (313,000)
Advances on note and interest receivable (1,250,000)
Purchase of long-term investment (1,000,000) (50,000)
Proceeds from sale of long-term investments 1,936,000 4,448,000
Net cash provided by (used for) investing activities (1,208,000) 4,085,000
FINANCING ACTIVITIES:    
Distribution of dividend to stockholders (3,056,000)
Sale of capital stock pursuant to exercise of option 14,000
Net cash used for financing activities (3,042,000)
Net cash used for discontinued operations (120,000)
Effects of exchange rate changes on cash (25,000) (1,000)
Net decrease in cash (3,700,000) (335,000)
Cash at beginning of year 17,724,000 18,059,000
Cash at end of year 14,024,000 17,724,000
Supplemental disclosure of cash flow information:    
Cash paid for income taxes 28,000 120,000
Unfunded investment in privately-held technology company $ 1,000,000