Note 2 - Subsequent Event - Tender Offer for Span-America Medical Systems, Inc.by Savaria Corporation and Merger (Details Textual) - Subsequent Event [Member] - Savaria Corporation [Member] $ / shares in Units, $ in Millions	May 01, 2017 USD ($) $ / shares
All-cash Tender Offer, Per Share | $ / shares	$ 29
All-cash Tender Offer | $	$ 80.2
All-Cash Tender Offer, Closing Condition, Percentage of Shares Received From Shareholders	0.66%
All-Cash Tender Offer, Percentage of Outstanding Shares Tenderred by Directors and Officers	15.90%