Note 9 - Government Assistance - Unrecognized Federal Tax Credits Expirations (Details) - Investment Tax Credit Carryforward [Member] $ in Thousands	Mar. 31, 2022 USD ($)
Tax losses carried forward	$ 3,331
Tax Year 2029 [Member]
Tax losses carried forward	9
Tax Year 2030 [Member]
Tax losses carried forward	23
Tax Year 2031 [Member]
Tax losses carried forward	36
Tax Year 2032 [Member]
Tax losses carried forward	345
Tax Year 2033 [Member]
Tax losses carried forward	353
Tax Year 2034 [Member]
Tax losses carried forward	348
Tax Year 2035 [Member]
Tax losses carried forward	415
Tax Year 2036 [Member]
Tax losses carried forward	229
Tax Year 2037 [Member]
Tax losses carried forward	252
Tax Year 2038 [Member]
Tax losses carried forward	259
Tax Year 2039 [Member]
Tax losses carried forward	355
Tax Year 2040 [Member]
Tax losses carried forward	370
Tax Year 2041 [Member]
Tax losses carried forward	146
Tax Year 2042 [Member]
Tax losses carried forward	$ 191

The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32559-109319

Name:	us-gaap_TaxCreditCarryforwardAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant