Note 8 - Paycheck Protection Program Loan (Details Textual) - USD ($)		9 Months Ended	12 Months Ended
Apr. 24, 2020	Dec. 31, 2021	Dec. 31, 2021	Dec. 31, 2020
Proceeds from Issuance of Unsecured Debt			$ 0	$ 1,343,000
Gain (Loss) on Extinguishment of Debt, Total			$ 1,358,000	$ 0
Paycheck Protection Program CARES Act [Member]
Proceeds from Issuance of Unsecured Debt	$ 1,343,000
Gain (Loss) on Extinguishment of Debt, Total		$ 1,358,000

Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 50
-Section 40
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=123467658&loc=d3e12355-112629

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 50
-Section 40
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-URI http://asc.fasb.org/extlink&oid=123467658&loc=d3e12317-112629

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585

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