Note 7 - Stockholders' Equity - Schedule of Stock by Class (Details) - shares shares in Thousands	Dec. 31, 2022	Dec. 31, 2021
Series B Preferred Stock, Authorized (in shares)	65,000
Series B Preferred Stock, Shares Issued (in shares)	1,270	1,275
Series B Preferred Stock [Member]
Series B Preferred Stock, Authorized (in shares)	7,235
Series B Preferred Stock, Shares Issued (in shares)	1,270	1,275
Undesignated [Member]
Series B Preferred Stock, Authorized (in shares)	57,765
Series B Preferred Stock, Shares Issued (in shares)	0	0

Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(28))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 13
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126973232&loc=SL123496158-112644

Name:	us-gaap_PreferredStockSharesIssued
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant