Note 11 - Paycheck Protection Program (PPP) Loan (Details Textual) - USD ($) $ in Thousands		6 Months Ended
Apr. 07, 2020	Jun. 30, 2021	Jun. 30, 2020
Proceeds from Notes Payable, Total			$ 1,576
Paycheck Protection Program CARES Act [Member]
Proceeds from Notes Payable, Total	$ 1,500

The cash inflow from a borrowing supported by a written promise to pay an obligation.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3255-108585

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