Note 3 - Business Combinations - Purchase Price Allocation (Details) - USD ($) $ in Thousands	Mar. 31, 2016	May. 01, 2015	Mar. 31, 2015	Mar. 31, 2014	Jun. 27, 2013
RadioPulse [Member]
Cash, restricted cash and cash equivalents		$ 196
Accounts receivable		1,497
Inventories		534
Property, plant and equipment		24
Prepaid expenses and other current assets		547
Identifiable intangible assets		2,867
Short-term borrowings		(2,354)
Accounts payable		(614)
Accruals and other liabilities		(1,926)
Total identifiable net liabilities		771
Goodwill		14,887
Total purchase consideration		$ 15,658
Acquired MCU Business [Member]
Inventories					$ 800
Property, plant and equipment					36
Identifiable intangible assets					24,000
Total identifiable net liabilities					24,836
Goodwill					25,164
Total purchase consideration					$ 50,000
Goodwill	$ 42,355		$ 27,375	$ 25,164