Note 6 - Long-Term Debt (Detail) (USD $)	1 Months Ended			12 Months Ended
	Oct. 30, 2012	Oct. 31, 2012	Jul. 25, 2011	Dec. 31, 2012	Dec. 31, 2010	May 31, 2013	Dec. 31, 2011	Oct. 31, 2010	Oct. 19, 2010	Jun. 30, 2006
Debt Instrument, Face Amount										$ 36,400,000
Line of Credit Facility, Maximum Borrowing Capacity (in Dollars)		5,000,000							10,000,000
Line of Credit Facility, Increase, Additional Borrowings (in Dollars)	5,000,000	5,000,000
Secured Debt, Current						30,000,000
Convertible Debt, Fair Value Disclosures						17,500,000
Debt Instrument, Unamortized Discount				2,051,000			4,641,000	3,200,000
Line of Credit Facility, Increase (Decrease), Other, Net			3,000,000
Warrants and Rights Outstanding		533,000
Legal Fees				42,000	73,500
Convertible Bond [Member]
Debt Instrument, Face Amount						$ 36,000,000