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Note 17 - Subsequent Events	3 Months Ended
	Mar. 31, 2019
Notes to Financial Statements
Subsequent Events [Text Block]	17. Subsequent Event On April 26, 2019, the Company acquired Pika Energy, Inc. (Pika), a designer and manufacturer of energy storage technologies that capture and store solar or grid power for homeowners and business owners. Pika was founded in 2010 and is located in Westbrook, Maine.

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The entire disclosure for significant events or transactions that occurred after the balance sheet date through the date the financial statements were issued or the date the financial statements were available to be issued. Examples include: the sale of a capital stock issue, purchase of a business, settlement of litigation, catastrophic loss, significant foreign exchange rate changes, loans to insiders or affiliates, and transactions not in the ordinary course of business.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 855
-URI http://asc.fasb.org/topic&trid=2122774

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