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Note 13 - Subsequent Events (Details Textual) - USD ($) $ in Thousands	1 Months Ended
	Apr. 30, 2022	Mar. 31, 2022	Aug. 17, 2021
Promissory Note Issued for Acquisition of Baltimore Property in Baltimore, MD [Member] | Majority Owned Subsidiary, PPT Baltimore [Member]
Debt Instrument, Face Amount			$ 1,560
Debt Instrument, Interest Rate, Stated Percentage			4.00%
Refinanced PPT Baltimore Promissory Note [Member]
Proceeds from Short-Term Debt, Total		$ 5,670
Refinanced PPT Baltimore Promissory Note [Member] | Subsequent Event [Member]
Proceeds from Short-Term Debt, Total	$ 3,700
Repayments of Short-Term Debt, Total	$ 1,560

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Face (par) amount of debt instrument at time of issuance.

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