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Note 14 - Certain Relationships and Related Transactions (Details Textual) - USD ($) $ in Millions | 12 Months Ended | 24 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2014 | Sep. 30, 2020 | Dec. 31, 2019
Investment in Subsidiary [Member] | Management and Accredited Investors [Member] |  |  |  |  |
Related Party Transaction, Amounts of Transaction |  |  | $ 1.0 |  |
AWMS Holdings, LLC [Member] |  |  |  |  |
Equity Method Investments | $ 3.4 | $ 3.4 | $ 3.4 |  |
Proceeds from Issuance of Private Placement | $ 3.8 | $ 3.8 |  |  |
Equity Method Investment, Ownership Percentage |  |  |  | 47.00% | 47.00%

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