Note 8 - Debt - Outstanding Letters of Credit (Details) - Letter of Credit [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Letters of Credit Amount Outstanding	$ 175	$ 175
Mt Laurel [Member]
Line of Credit, Issue Date	Mar. 29, 2010
Line of Credit, Expiration Date	Mar. 31, 2020
Lease Expiration Date	Apr. 30, 2021
Letters of Credit Amount Outstanding	$ 125	125
Mansfield [Member]
Line of Credit, Issue Date	Oct. 27, 2010
Line of Credit, Expiration Date	Nov. 08, 2019
Lease Expiration Date	Aug. 23, 2021
Letters of Credit Amount Outstanding	$ 50	$ 50