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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 |

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