Note O - Equity (Details Textual) - USD ($)						6 Months Ended	27 Months Ended
	Nov. 05, 2021	Nov. 02, 2021	Mar. 29, 2019	Mar. 31, 2018	Mar. 24, 2017	Jun. 30, 2022	Jun. 30, 2022	Mar. 24, 2022	Dec. 31, 2021	Aug. 25, 2021	Jun. 30, 2021	Mar. 24, 2020	Apr. 07, 2019	Nov. 01, 2016
Class of Warrant or Right, Outstanding (in shares)						1,702,128	1,702,128		1,702,128
Dividends Payable						$ 1,500,000	$ 1,500,000				$ 1,500,000
Common Stock, Shares, Issued (in shares)						7,762,375	7,762,375		7,762,375
Purchase Agreement With Company, Operating Partnership, and HSCP Strategic III, L.P. [Member]
Limited Partnership Purchase Agreement, Consideration Transferred		$ 20,000,000.0
Tender Offer [Member]
Shares Issued, Price Per Share (in dollars per share)	$ 11.75
Stock Issued During Period, Shares, New Issues (in shares)	878,082
Proceeds from Issuance of Common Stock	$ 10,300,000
Subscription Agreement [Member]
Common Stock, Shares, Issued (in shares)	22,424
Maximum [Member] | Tender Offer [Member]
Common Stock, Shares, Issued (in shares)	900,506
Series A Warrants Issued Per $1,000 of Shares Subscribed [Member]
Class of Warrant or Right, Outstanding (in shares)					30
Warrants or Rights, Exercise Price, Percent of Stock Price					110.00%
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)					$ 25
Series 1 Warrants Issued Per $1,000 of Shares Subscribed [Member]
Class of Warrant or Right, Outstanding (in shares)													35
Warrants or Rights, Exercise Price, Percent of Stock Price													110.00%
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)						$ 25	$ 25						$ 25
Warrants and Rights Outstanding, Term (Year)													5 years
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)						1,382,675	1,382,675
Proceeds from Warrant Exercises						$ 34,600,000
Color Up to Purchase Common Stock Warrants [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)										$ 11.75
Warrants and Rights Outstanding, Term (Year)										5 years
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)										1,702,128
Class of Warrant or Right, Maximum Aggregate Cash Purchase Price Allowed										$ 20,000,000
Series A Convertible Redeemable Preferred Stock [Member]
Stock Offering, Shares, Value														$ 50,000,000
Preferred Stock, Par or Stated Value Per Share (in dollars per share)														$ 0.0001
Proceeds from Issuance or Sale of Equity, Total					$ 2,500,000
Preferred Stock, Dividend Rate, Percentage				7.50%	5.75%
Preferred Stock, Stated Value (in dollars per share)					$ 1,000
Series A Preferred Stock [Member]
Preferred Stock, Par or Stated Value Per Share (in dollars per share)						$ 0.0001	$ 0.0001		$ 0.0001
Preferred Stock, Distributions Declared, Value								$ 1,098,000
Dividends, Preferred Stock, Total							$ 597,000
Dividends Payable						$ 501,000	$ 501,000		$ 393,000
Preferred Stock, Shares Authorized (in shares)						50,000	50,000		50,000
Series 1 Convertible Redeemable Preferred Stock [Member]
Preferred Stock, Par or Stated Value Per Share (in dollars per share)			$ 0.0001
Preferred Stock, Distributions Declared, Value												$ 12,900,000
Dividends, Preferred Stock, Total							$ 6,400,000
Dividends Payable						$ 6,500,000	$ 6,500,000		$ 5,100,000
Preferred Stock, Shares Authorized (in shares)			97,000
Increased Dividend Rate Costs Per Quarter						$ 150,000
Preferred Stock, Conversion, Initial Amount			$ 1,000
Series 1 Convertible Redeemable Preferred Stock [Member] | Minimum [Member]
Preferred Stock, Dividend Rate, Percentage			5.50%			5.50%
Series 1 Convertible Redeemable Preferred Stock [Member] | Maximum [Member]
Preferred Stock, Dividend Rate, Percentage						7.00%
OP Units [Member]
Equity Units, Outstanding, Total (in shares)						17,000,000.0
OP Units [Member] | Purchase Agreement With Company, Operating Partnership, and HSCP Strategic III, L.P. [Member]
Limited Partners' Capital Account, Units Issued (in shares)	900,506	1,702,128
Limited Partners, Option to Purchase Units (in shares)		425,532
Limited Partner, Option to Purchase Units, Price Per Share (in dollars per share)	$ 11.75	$ 11.75
Class A Units [Member] | Purchase Agreement With Company, Operating Partnership, and HSCP Strategic III, L.P. [Member]
Limited Partners' Capital Account, Units Issued (in shares)		425,532
Convertible OP Units [Member]
Equity Units, Outstanding, Total (in shares)						0