Note 8 - Goodwill and Acquired Intangible Assets (Details Textual) - USD ($)	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Amortization of Intangible Assets, Total	$ 1,815,050	$ 0
B & R [Member]
Finite-lived Intangible Assets Acquired	$ 188,503,000
B & R [Member] \| Trade Names [Member]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	10 years
B & R [Member] \| Customer Relationships [Member]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	20 years

Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition

Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, from an acquisition.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
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