BUSINESS AND SUMMARY OF ACCOUNTING POLICIES - Sale of real property (Details) - USD ($)	Jun. 18, 2019	Sep. 30, 2019	Dec. 31, 2018
Sale of real property
Land		$ 507,000	$ 1,281,000
Building and improvements		3,163,000	6,262,000
Accumulated depreciation		(18,608,000)	(20,380,000)
NET PROPERTY AND EQUIPMENT		$ 8,920,000	$ 9,775,000
Florida Pneumatic [Member]
Sale of real property
Purchase price	$ 9,200,000
Selling Expense	451,000
Net proceeds	8,749,000
Land	774,000
Building and improvements	2,956,000
Accumulated depreciation	(2,798,000)
NET PROPERTY AND EQUIPMENT	932,000
Gain on sale of the Jupiter Facility	$ 7,817,000