Note 4 - Promissory Note (Details Textual) - USD ($) $ in Millions	3 Months Ended
Dec. 31, 2019	Mar. 10, 2020
Loan Agreement with Primary Financial Leader [Member]
Debt Instrument, Face Amount		$ 3.5
Leveling 8 [Member] \| Promissory Note [Member]
Proceeds from Collection of Notes Receivable, Gross	$ 0.7
Proceeds from Collection of Notes Receivable, Interest	$ 0.1
Notes Receivable, Interest Rate	6.00%

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=119993939&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