Note 8 - Commitments (Details Textual) - USD ($)	1 Months Ended	12 Months Ended
Nov. 30, 2016	Dec. 31, 2016	Dec. 31, 2015
Lessee Leasing Arrangements, Operating Leases, Term of Contract	5 years
Operating Leases, Rent Expense, Net		$ 321,000	$ 266,000

Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717

Name:	us-gaap_OperatingLeasesRentExpenseNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration