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Note 6 - Investments (Details Textual) $ in Thousands	3 Months Ended					6 Months Ended
Note 6 - Investments (Details Textual) $ in Thousands	Sep. 30, 2022 USD ($)	Jun. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Jun. 30, 2021 USD ($)	Mar. 31, 2021 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)	Jun. 03, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions		201				201			138
Long-Term Debt, Gross		$ 307,006				$ 307,006			$ 314,072
Private Company [Member]
Increase (Decrease) in Debt Securities, Trading, and Equity Securities, FV-NI, Total		0		$ 0		0	$ 0
Other-than-temporary Impairment Loss, Debt Securities, Portion Recognized in Earnings		0		0		0	0
Loans Payable [Member]
Long-Term Debt, Gross		193,272				193,272			196,386
Net Lease Note [Member] \| Loans Payable [Member]
Long-Term Debt, Gross										$ 9,000
Limited Liability Investments [Member]
Other than Temporary Impairment Losses, Investments, Total						0
Equity Method Investments		1,215				1,215			1,901
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments		0				0
Limited Liability Investments [Member] \| Forecast [Member]
Proceeds from Limited Partnership Investments	$ 800
Net Lease [Member]
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures, Total								$ 19,000	18,800
Equity Securities without Readily Determinable Fair Value, Impairment Loss, Annual Amount				0
Gains (Losses) on Sales of Investment Real Estate			$ 14,300
Equity Securities, FV-NI, Realized Gain							1,200
Equity Securities, FV-NI, Unrealized Gain							1,200
Net Lease [Member] \| Maximum [Member]
Equity Securities without Readily Determinable Fair Value, Impairment Loss, Annual Amount		100			$ 100	100
Private Company Investments [Member]
Investment Owned, at Fair Value		800				800			$ 800
Other-than-temporary Impairment Loss, Debt Securities, Portion Recognized in Earnings		$ 0		$ 0		$ 0	$ 0