Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Allowance for doubtful accounts	$ 3,361	$ 2,624
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Preferred stock, shares authorized (in shares)	100,000	100,000
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	500,000,000	500,000,000
Common stock, shares issued (in shares)	17,814,672	17,812,755
Common stock, shares outstanding (in shares)	17,814,672	17,812,755
Series A Cumulative Non-Voting Preferred Stock [Member]
Preferred stock, shares authorized (in shares)	140	140
Preferred stock, dividend rate, percentage	12.50%	12.50%