Note 4 - Accounting for Stock-based Compensation - Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands		9 Months Ended	12 Months Ended
		Sep. 30, 2016	Dec. 31, 2015
Outstanding (in shares)		1,146,000
Outstanding (in dollars per share)		$ 1.52
Outstanding at the beginning of the period		6 years 18 days	6 years 270 days
Outstanding at the beginning of the period	[1]	$ 7
Expire (in shares)		40,000
Expire (in dollars per share)		$ 1.16
Forfeited (in shares)		105,000
Forfeited (in dollars per share)		$ 1.38
Outstanding (in shares)		1,001,000	1,146,000
Outstanding (in dollars per share)		$ 1.55	$ 1.52
Exercisable options at the end of the period (in shares)		756,000
Exercisable options at the end of the period (in dollars per share)		$ 1.56
Exercisable options at the end of the period		5 years 182 days
Exercisable options at the end of the period	[1]	$ 3

[1] Calculation of aggregate intrinsic value is based upon the share price of the Company's common stock as of September 30, 2016 $0.77 per share.