CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) [Parenthetical] - USD ($) $ in Thousands	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Allowance for doubtful accounts (in dollars)	$ 100		$ 100
Common stock, shares authorized (in shares)	10,000,000		10,000,000
Common Stock
Common stock, shares issued (in shares)	5,691,000	5,688,000	5,817,000	5,714,000
Common stock, shares outstanding (in shares)	5,691,000	5,688,000	5,817,000	5,714,000