Note 10 - Litigation (Detail) (USD $)	3 Months Ended		3 Months Ended		3 Months Ended	6 Months Ended	12 Months Ended	1 Months Ended
	Dec. 31, 2012	May 03, 2012 Attorney Fees [Member] Gross [Member]	Dec. 31, 2012 Attorney Fees [Member] Linear Technology Corporation [Member]	May 03, 2012 Taxable Costs [Member] Gross [Member]	Mar. 31, 2012 Silergy [Member]	Jun. 30, 2013 Silergy [Member]	Dec. 31, 2012 Silergy [Member]	Dec. 31, 2011 Gross [Member]
Gain Contingency, Unrecorded Amount	$ 2.3	$ 9,100,000		$ 300,000
Proceeds from Legal Settlements	$ 2.3		$ 200,000		$ 300,000	$ 2	$ 1,200,000	$ 2,000,000