Note 10 - Commitments and Contingencies (Details Textual) - USD ($)
|3 Months Ended|
Mar. 31, 2017
Mar. 31, 2016
|Operating Leases, Rent Expense, Net||$ 744,295||$ 752,495|
Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.
Reference 1: http://www.xbrl.org/2003/role/presentationRef