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Note 16 - 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
Dec. 31, 2020
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% 47.00%