Note 8 - Stock-based Compensation - Restricted Stock Awards Activity (Details) - Restricted Stock [Member] - $ / shares		6 Months Ended	12 Months Ended
		Dec. 31, 2015	Dec. 31, 2016
Shares, unvested (in shares)		16,667
Weighted-average fair value price per share, nonvested (in dollars per share)		$ 9.66
Shares, granted (in shares)	[1]
Weighted-average fair value price per share, granted (in dollars per share)	[1]
Shares, vested (in shares)
Weighted-average fair value price per share, vested (in dollars per share)
Shares, forfeited or expired (in shares)	[2]	(16,667)
Weighted-average fair value price per share, forfeited and expired (in dollars per share)	[2]	$ (9.66)
Shares, unvested (in shares)
Weighted-average fair value price per share, nonvested (in dollars per share)
Shares, forfeited or expired (in shares)	[2]	16,667
Weighted-average fair value price per share, forfeited and expired (in dollars per share)	[2]	$ 9.66

[1] Restricted stock was granted on April 1, 2014 to Daniel K. Jan of 16,667 shares to vest beginning on April 1, 2017. The award was part of his employment agreement and the grant price is the closing price of the stock on April 1, 2014 of $9.66. The unvested shares are forfeited upon termination of his employment.

[2] Daniel K. Jan was terminated as of December 31, 2015, all unvested shares were forfeited.