Note 13 - Revenue by Product Group, by Significant Customer and by Geographic Location; Geographic Information (Details Textual) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Inventory Recall Expense			$ 1,100	$ 900
Inventory Recall Reserve	$ 0	$ 0
Mitek [Member]
Revenues From Agreements as Percent of Total Revenue	49.00%	71.00%	73.00%

Reflects the amount charged against earnings comprised of the costs to announce and effect a recall of defective merchandise.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.3)
-URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227

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