LEASED PROPERTY (Details)			12 Months Ended		38 Months Ended	50 Months Ended	62 Months Ended
	Jun. 17, 2020 USD ($)	Feb. 15, 2019 USD ($) ft²	Apr. 30, 2020 USD ($)	Apr. 30, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2020 USD ($)
Leased property
Square feet (in area) | ft²		23,924
Monthly base rate	$ 4,241	$ 11,500			$ 26,844	$ 29,257	$ 32,876
Number Of Years For Which Monthly Base Rates Fixed		62 months
Asset category
Property, plant and equipment, gross			$ 6,371,000	$ 5,879,000
Less accumulated depreciation			(4,388,000)	(4,056,000)
Property, plant and equipment, net			1,983,000	1,823,000
Depreciation on leased asset			48,000	35,000
Assets Leased to Others
Asset category
Property, plant and equipment, gross			1,265,000	1,265,000
Less accumulated depreciation			(707,000)	(659,000)
Property, plant and equipment, net			558,000	606,000
Land
Asset category
Property, plant and equipment, gross			265,000	265,000
Buildings and improvements
Asset category
Property, plant and equipment, gross			$ 1,000,000	$ 1,000,000
Minimum
Leased property
Monthly base rate		$ 11,500
Maximum
Leased property
Monthly base rate		$ 15,500