Note 8 - Debt (Details Textual) - Letter of Credit [Member] - USD ($) $ in Thousands	Sep. 30, 2019	Apr. 01, 2019	Mar. 31, 2019	Dec. 31, 2018
Letters of Credit Outstanding, Amount	$ 140			$ 175
Mt Laurel [Member]
Letters of Credit Outstanding, Amount	$ 90	$ 90	$ 125	$ 125

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

No definition available.

Name:	us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant