Note 11 - Acquisitions (Details Textual) - CAD Enterprises, Inc. [Member] - USD ($)	Jul. 05, 2018	Jul. 01, 2018
Business Combination, Consideration Transferred, Total	$ 21,000,000	$ 21,000,000
Payments to Acquire Businesses, Gross	$ 12,000,000	$ 12,000,000

Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 30
-Paragraph 7
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