Note 3 - Stock-based Compensation - Common Stock Unit Activity (Details) (USD $)	3 Months Ended
	Mar. 31, 2015
Nonvested (in shares)	23,984
Nonvested (in dollars per share)	$ 1.37
Vested (in shares)	(6,002)
Vested (in dollars per share)	$ 1.37
Nonvested at March 31, 2015 (in shares)	17,982