Note 11 - Share Based Compensation - Information About Stock Options Outstanding (Details)	12 Months Ended
	Dec. 31, 2016 $ / shares shares
Number of Outstanding Options (in shares) | shares	42,000
Number of Vested Options (in shares) | shares	27,000
Exercise Price Range 01 [Member]
Range of Exercise Prices Lower Unit (in dollars per share) | $ / shares	$ 5.27
Range of Exercise Prices Upper Unit (in dollars per share) | $ / shares	$ 6.10
Number of Outstanding Options (in shares) | shares	17,000
Number of Vested Options (in shares) | shares	2,000
Weighted-Average Remaining Contractual Life Outstanding (Year)	6 years 226 days
Weighted-Average Remaining Contractual Life Vested (Year)	1 year 7 days
Weighted-Average Exercise Price Outstanding (in dollars per share) | $ / shares	$ 6
Weighted-Average Exercise Price Vested (in dollars per share) | $ / shares	$ 5.27
Exercise Price Range 03 [Member]
Number of Outstanding Options (in shares) | shares	25,000
Number of Vested Options (in shares) | shares	25,000
Weighted-Average Remaining Contractual Life Outstanding (Year)	200 days
Weighted-Average Remaining Contractual Life Vested (Year)	200 days
Weighted-Average Exercise Price Outstanding (in dollars per share) | $ / shares	$ 9.81
Weighted-Average Exercise Price Vested (in dollars per share) | $ / shares	$ 9.81