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Note 12 - Commitments - Payments Under Retention Bonus Plan (Details) | 12 Months Ended
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Dec. 31, 2019 USD ($)
Distributions paid | $ 14,573
Board Members [Member] |
Distributions paid | 9,471
Chief Executive Officer [Member] |
Distributions paid | 2,390
Chief Operating Officer [Member] |
Distributions paid | 2,151
Other Employees [Member] |
Distributions paid | $ 561

X
- Definition Amount of distribution made to individual in accordance with deferred compensation arrangement. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_TitleOfIndividualAxis=srt_ChiefOperatingOfficerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |