Note 1 - Organization and Summary of Significant Accounting Policies (Details Textual) - USD ($)	3 Months Ended	12 Months Ended		192 Months Ended
	Jun. 30, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018
Marketable Securities, Total		$ 349,000	$ 438,000	$ 349,000
Marketable Securities, Unrealized Gain (Loss), Total		113,000	23,000
Cost-method Investments, Other than Temporary Impairment		363,000	103,000
Gain on Sale of Investments			1,738,000
Cost-method Investments, Realized Gain (Loss), Excluding Other than Temporary Impairments, Total			1,466,000
Gain Funds Held in Escrow Released			372,000
Cost Method Investments		760,000	1,035,000	$ 760,000
Allocated Share-based Compensation Expense, Total		$ 62,000	$ 52,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross		12,000	17,000	1,314,500
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value		$ 4.86	$ 2.34
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total		$ 73,000		$ 73,000
Revenue from Contract with Customer, Including Assessed Tax		20,100,000	$ 9,179,000
Cost of Revenue, Total		8,524,000	4,471,000
Operating Leases, Future Minimum Payments Due, Total		1,400,000		$ 1,400,000
Service [Member]
Revenue from Contract with Customer, Including Assessed Tax		18,751,000	9,089,000
Cost of Revenue, Total		$ 8,388,000	4,384,000
Accounting Standards Update 2014-09 [Member] | Restatement Adjustment [Member]
Revenue from Contract with Customer, Including Assessed Tax			(123,000)
Cost of Revenue, Total			(24,000)
Cumulative Effect on Retained Earnings, Net of Tax, Total			(99,000)
Accounting Standards Update 2014-09 [Member] | Restatement Adjustment [Member] | Service [Member]
Revenue from Contract with Customer, Including Assessed Tax			636,000
Cost of Revenue, Total			$ 209,000
The 2011 Non-employee Director Stock Option Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross		12,000	17,000
Lumense Inc. [Member]
Cost-method Investments, Other than Temporary Impairment	$ 250,000	$ 250,000
General and Administrative Expense [Member]
Depreciation, Total		$ 614,000	$ 330,000