Note 10 - Summary of Nonvested Stock Options (Details)	3 Months Ended
	Mar. 31, 2016 $ / shares shares
Nonvested Stock Option [Member]
Nonvested Stock Options, beginning balance (in shares) | shares	922,658
Nonvested Stock Options, beginning balance (in dollars per share) | $ / shares	$ 10.35
Vested during period (in shares) | shares	(14,875)
Vested during period (in dollars per share) | $ / shares	$ 8.11
Forfeited (in shares) | shares	(5,250)
Forfeited (in dollars per share) | $ / shares	$ 7.76
Nonvested Stock Options, ending balance (in shares) | shares	902,533
Nonvested Stock Options, ending balance (in dollars per share) | $ / shares	$ 10.40
Nonvested Restricted Stock [Member]
Nonvested Restricted Stock, beginning balance (in shares) | shares	178
Nonvested Restricted Stock, beginning balance (in dollars per share) | $ / shares	$ 46.91
Vested during period (in shares) | shares
Vested during period (in dollars per share) | $ / shares
Forfeited (in shares) | shares
Forfeited (in dollars per share) | $ / shares
Nonvested Restricted Stock, ending balance (in shares) | shares	178
Nonvested Restricted Stock, ending balance (in dollars per share) | $ / shares	$ 46.91