Note 10 - Summary of Nonvested Stock Options (Details) - $ / shares	3 Months Ended
	Jun. 30, 2016	Mar. 31, 2016
Nonvested Stock Option [Member]
Nonvested Stock Options, beginning balance (in shares)	902,533	922,658
Nonvested Stock Options, beginning balance (in dollars per share)	$ 10.40	$ 10.35
Vested during period (in shares)	(12,683)	(14,875)
Vested during period (in dollars per share)	$ 8.49	$ 8.11
Forfeited (in shares)		(5,250)
Forfeited (in dollars per share)		$ 7.76
Nonvested Stock Options, ending balance (in shares)	910,114	902,533
Nonvested Stock Options, ending balance (in dollars per share)	$ 10.66	$ 10.40
Granted (in shares)	20,264
Granted (in dollars per share)	$ 13.82
Nonvested Restricted Stock [Member]
Nonvested Restricted Stock, beginning balance (in shares)	178	178
Nonvested Restricted Stock, beginning balance (in dollars per share)	$ 46.91	$ 46.91
Vested during period (in shares)	(178)
Vested during period (in dollars per share)	$ 46.91
Forfeited (in shares)
Forfeited (in dollars per share)
Nonvested Restricted Stock, ending balance (in shares)	10,640	178
Nonvested Restricted Stock, ending balance (in dollars per share)	$ 45.12	$ 46.91
Granted (in shares)	10,640
Granted (in dollars per share)	$ 45.12