Inventories (Details) - USD ($)	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019
Inventory Disclosure [Abstract]
Raw materials	$ 3,983,000	$ 4,339,000
Finished goods	17,287,000	24,569,000
Inventories	21,270,000	28,908,000
Less reserve for excess and obsolete inventory	(4,948,000)	(5,698,000)
Inventories, net	$ 16,322,000	$ 23,210,000	$ 25,604,000	$ 27,646	$ 35,377