Note 1 - Summary of Significant Accounting Policies (Details Textual) - Accounting Standards Update 2016-02 [Member]	Apr. 01, 2019 USD ($)
Prepaid Expenses and Other Current Assets [Member]
Operating Lease, Right-of-Use Asset	$ 220,000
Accrued Expenses and Other Current Liabilities [Member]
Operating Lease, Liability, Current	$ 220,000

Present value of lessee's discounted obligation for lease payments from operating lease, classified as current.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977

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