Note 10 - Information about Stock Options (Details)	12 Months Ended
	Dec. 31, 2015 USD ($) $ / shares shares
Range of Exercise Prices, Lower Limit (in dollars per share)	$ 1.51
Range of Exercise Prices, Upper Limit (in dollars per share)	$ 1.98
Options Outstanding Options (in shares) | shares	225,000
Options Outstanding Weighted Average Exercise Price (in dollars per share)	$ 1.52
Options Outstanding Weighted Average Remaining Contract Life	3 years 277 days
Options Outstanding Aggregate Intrinsic Value | $	$ 51,000
Options Exercisable Options (in shares) | shares	65,000
Options Exercisable Weighted Average Exercise Price (in dollars per share)	$ 1.43
Options Exercisable Weighted Average Remaining Contract Life	2 years 105 days
Options Exercisable Aggregate Intrinsic Value | $	$ 21,000