Note 17 - Related-party Transactions (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cleveland Warehouse [Member]
Lessee Leasing Arrangements, Operating Leases, Renewal Term	5 years
Chief Executive Officer [Member] | Related Entity that Owns Cleveland Warehouse [Member]
Equity Method Investment, Ownership Percentage	50.00%
Affiliated Entity [Member] | Cleveland Warehouse [Member]
Operating Leases, Rent Expense	$ 204
Operating Leases, Rent Expense	$ 8,700	$ 8,200	$ 7,500