Note 17 - Subsequent Event (Details Textual) - Subsequent Event [Member] - Golden Valley Minnesota [Member] - USD ($) $ in Millions		3 Months Ended
Apr. 14, 2022	Jun. 30, 2022
Proceeds from Sale of Buildings	$ 4.1
Gain (Loss) on Disposition of Property Plant Equipment, Total		$ 3.7

Amount of gain (loss) on sale or disposal of property, plant and equipment assets, including oil and gas property and timber property.

Reference 1: 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 https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585

Name:	us-gaap_GainLossOnSaleOfPropertyPlantEquipment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration