CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) [Parenthetical] - USD ($) $ in Thousands	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)	5,688,000		5,714,000
Common stock, shares outstanding (in shares)	5,688,000	5,817,000	5,714,000