Note 8 - Operating Lease Commitments (Details Textual) - USD ($)	3 Months Ended
Jun. 30, 2017	Jun. 30, 2016
Operating Leases, Rent Expense	$ 100,000	$ 200,000
Operating Leases, Income Statement, Sublease Revenue	$ 13,000

The amount of revenue recognized for the period under subleasing arrangements.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 20
-Section 55
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=77891322&loc=d3e41620-112719

Name:	us-gaap_OperatingLeasesIncomeStatementSubleaseRevenue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration