Note 6 - Investments (Details Textual) $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	138	5
Other than Temporary Impairment Losses, Investments, Total	$ 100
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures, Total	18,800	$ 32,800
Equity Securities without Readily Determinable Fair Value, Impairment Loss, Annual Amount	100	100
Long-term Debt, Gross	314,072	300,667
Increase (Decrease) in Debt Securities, Trading, and Equity Securities, FV-NI, Total		0
Other-than-temporary Impairment Loss, Debt Securities, Portion Recognized in Earnings, Total	(0)	117
Loss on Sale of Investments		200
Private Company [Member]
Increase (Decrease) in Debt Securities, Trading, and Equity Securities, FV-NI, Total	0
Other-than-temporary Impairment Loss, Debt Securities, Portion Recognized in Earnings, Total	0	700
Loans Payable [Member]
Long-term Debt, Gross	196,386	184,467
Net Lease Note [Member] | Notes Payable [Member]
Long-term Debt, Gross	14,300
Equity Securities, FV-NI, Realized Gain	800
Equity Securities, FV-NI, Unrealized Gain	800
Net Lease Note [Member] | Loans Payable [Member]
Long-term Debt, Gross	0	9,000
Equity Securities, FV-NI, Realized Gain	1,200
Equity Securities, FV-NI, Unrealized Gain	1,200
Limited Liability Investments [Member]
Other than Temporary Impairment Losses, Investments, Total	0	100
Equity Method Investments	1,901	3,692
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments	0
Private Company Investments [Member]
Investment Owned, at Fair Value	800	800
Increase (Decrease) in Debt Securities, Trading, and Equity Securities, FV-NI, Total	0	0
Other-than-temporary Impairment Loss, Debt Securities, Portion Recognized in Earnings, Total	$ 0	$ 700