Note 12 - ABN Amro Bank Swap (Details) - ABN Bank [Member] - Interest Rate Swap [Member] $ in Thousands	Jun. 03, 2016 USD ($)
Effective (start) date	Apr. 13, 2018
Termination date	Jul. 13, 2021
Notional amount on effective date	$ 16,575
Interest rate payable	1.4425%

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

Name:	invest_DerivativeNotionalAmount
Namespace Prefix:	invest_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant