Note 7 - Notes Payable (Details Textual) - Paycheck Protection Program, CARES Act [Member] - USD ($)		3 Months Ended
May 07, 2020	Mar. 31, 2021
Proceeds from Issuance of Debt	$ 332,000
Debt Instrument, Decrease, Forgiveness		$ 131,000

The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3255-108585

Name:	us-gaap_ProceedsFromIssuanceOfDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration