Note 12 - Intangible assets, net (Detail) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2013
Amortization of Intangible Assets	$ 263,000	$ 262,000
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months						771,000
Finite-Lived Intangible Assets, Amortization Expense, Year Three					1,027,000
Finite-Lived Intangible Assets, Amortization Expense, Year Four				988,000
Finite-Lived Intangible Assets, Amortization Expense, Year Five			$ 498,000