Note 5 - Acquisitions and Divestitures (Tables)  | 
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Dec. 31, 2020  | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block] | 
    
 
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- Definition Tabular disclosure of the amounts recognized as of the acquisition date for each major class of assets acquired and liabilities assumed. May include but not limited to the following: (a) acquired receivables; (b) contingencies recognized at the acquisition date; and (c) the fair value of noncontrolling interests in the acquiree. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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- References No definition available. 
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