Note 12 - Intangible assets (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2013	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Disclosure Text Block [Abstract]
Amortization of Intangible Assets	$ 266,000	$ 261,000		$ 529,000	$ 523,000
Finite-Lived Intangible Assets, AmortizationExpense, Next Six Months			521,000
Finite-Lived Intangible Assets, Amortization Expense, Year Two									1,043,000
Finite-Lived Intangible Assets, Amortization Expense, Year Three								1,043,000
Finite-Lived Intangible Assets, Amortization Expense, Year Four							1,003,000
Finite-Lived Intangible Assets, Amortization Expense, Year Five						$ 506,000