INVESTMENT PROPERTIES (Details Textual) - a	Dec. 31, 2016	Dec. 31, 2015	Sep. 14, 2014
Office building and other commercial property:
Area of Land			9.5
Other Hopkinton Land [Member]
Office building and other commercial property:
Area of Land	50	50
Other Paxton Land [Member]
Office building and other commercial property:
Area of Land	20,000	20,000
Other Montpelier Vermont Land And Improvements [Member]
Office building and other commercial property:
Area of Land	5.4	5.4