Note 5 - Disposition Activities (Details Textual)			1 Months Ended
	Dec. 07, 2019 USD ($) a	Aug. 27, 2019 USD ($) a	Aug. 30, 2018 USD ($)
Flowerfield Complex in Smithtown, New York [Member]
Area of Land | a		9
Flowerfield Complex in Smithtown, New York [Member] | BSL St. James LLC [Member]
Proceeds from Sale of Property, Plant, and Equipment, Total		$ 16,800,000
Cortlandt Manor Property In New York [Member]
Area of Land | a	4.5
Proceeds from Sale of Property, Plant, and Equipment, Total	$ 5,720,000
Port Jefferson Professional Park [Member]
Proceeds from Sale of Property, Plant, and Equipment, Total			$ 800,000