Note 13 - Related Party Receivables (Details Textual)	Dec. 31, 2021 USD ($)
Accounts Receivable, Related Parties, Current	$ 21,000
Doran Canterbury I and II Joint Ventures [Member]
Notes Receivable, Related Parties	2,027,000
Interest Receivable	$ 130,000
Doran Canterbury I and II Joint Ventures [Member] \| Prime Rate [Member]
Financing Receivable, Interest Rate	2.00%

Amount of receivables arising from transactions with related parties due within one year or the normal operating cycle, if longer.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
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-Section S99
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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-Section S99
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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant