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Note 1 - Summary of Significant Accounting Policies (Details Textual) $ / shares in Units, $ in Thousands |  | 12 Months Ended | 48 Months Ended
--- | --- | --- | ---
Mar. 06, 2019 $ / shares shares | Dec. 31, 2020 USD ($) a | Dec. 31, 2019 USD ($) | Mar. 09, 2014
Asset Impairment Charges, Total |  | $ 196 | $ 3,643 |
Impairment of Deferred Development Costs |  | $ 0 | $ 0 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in shares) | shares | 25,000 |  |  |
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price (in dollars per share) | $ / shares | $ 5.20 |  |  |
Vested Annually [Member] | Share-based Payment Arrangement, Option [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  |  |  | 20.00%
Minimum [Member] |  |  |  |
Property, Plant and Equipment, Useful Life (Year) |  | 3 years |  |
Maximum [Member] |  |  |  |
Property, Plant and Equipment, Useful Life (Year) |  | 40 years |  |
HAWAII |  |  |  |
Area of Land (Acre) | a |  | 23,000 |  |

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