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Note 1 - Description of Business and Significant Accounting Policies (Details Textual) | 12 Months Ended
--- | ---
Dec. 31, 2021 USD ($) a shares | Dec. 31, 2020 USD ($) shares
Asset Impairment Charges, Total | $ 40,000 | $ 196,000
Impairment of Deferred Development Costs | $ 0 | $ 0
Weighted Average Number of Shares Outstanding, Basic and Diluted (in shares) | shares | 19,353,647 | 19,282,157
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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