Condensed Consolidated Statements of Cash Flows (unaudited) - USD ($)	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Cash flow from operating activities:
Net loss	$ (1,577,000)	$ (2,959,000)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Equity-based compensation	1,320,000	1,118,000
Depreciation	1,046,000	1,078,000
Noncash lease expense	201,000
Loss on disposal of fixed asset	11,000	55,000
Amortization of premium of marketable securities	44,000	160,000
Provision for bad debt		230,000
Deferred taxes		(535,000)
Equity loss in investee	428,000	491,000
Other	38,000	38,000
Changes in operating assets and liabilities:
Accounts receivable	368,000	(990,000)
Other current and long-term assets	183,000	22,000
Accounts payable	(124,000)	(1,344,000)
Accrued liabilities	(20,000)	1,288,000
Operating lease liabilities	(188,000)
Net cash provided by (used in) operations	1,730,000	(1,348,000)
Cash flow from investing activities:
Purchases of fixed assets	(633,000)	(1,152,000)
Purchase of marketable securities	(10,178,000)	(11,470,000)
Maturities of marketable securities	11,500,000	11,656,000
Purchase of equipment contributed to Equity Method Investee		(510,000)
Net cash (used in) provided by investing activities	689,000	(1,476,000)
Cash flow from financing activities:
Proceeds from exercise of stock options	9,000	9,000
Net cash provided by financing activities	9,000	9,000
Effect of exchange rate changes on cash and cash equivalents	1,000	(21,000)
Net decrease in cash	2,429,000	(2,836,000)
Cash balance at beginning of period	6,736,000	6,490,000
Cash balance at end of period	9,165,000	3,654,000
Supplemental disclosures of cash flow information:
Income taxes paid	20,000	1,000
Supplemental disclosures of non-cash investing and financing activities:
Fixed assets included in accounts payable	$ 5,000	$ 1,011,000