Note 8 - Notes Payable - Notes Due to Related Parties (Details) (Parentheticals) - USD ($)	Mar. 31, 2019	Dec. 31, 2018
CAD Enterprises, Inc. [Member]
Notes payable, face value	$ 9,000,000	$ 9,000,000
Promissory Note 1 [Member]
Notes payable, face value	2,000,000	2,000,000
Promissory Note 2 [Member]
Notes payable, face value	$ 2,768,662	$ 2,768,662

Face (par) amount of debt instrument at time of issuance.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant