Quarterly report pursuant to Section 13 or 15(d)

Note 4 - Capital Stock, Stock Plans and Stock-based Compensation - Company's Stock Option Plans (Details)

v3.7.0.1
Note 4 - Capital Stock, Stock Plans and Stock-based Compensation - Company's Stock Option Plans (Details) - USD ($)
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Options outstanding, shares (in shares) 247,200 218,200
Options outstanding, weighted average exercise price (in dollars per share) $ 6.69 $ 7.65
Options granted, shares (in shares) 6,000
Options granted, weighted average exercise price (in dollars per share) $ 3.79
Options forfeited/expired, shares (in shares) (30,000)
Options forfeited/expired, weighted average exercise price (in dollars per share) $ 5
Options outstanding, shares (in shares) [1] 223,200 218,200
Options outstanding, weighted average exercise price (in dollars per share) [1] $ 6.84 $ 7.65
Options outstanding, weighted average remaining contractual term (Year) [1] 4 years 255 days 4 years 219 days
Options outstanding, aggregate intrinsic value [1],[2] $ 4,380 $ 13,980
Options exercisable, shares (in shares) [1] 163,867 181,533
Options exercisable, weighted average exercise price (in dollars per share) [1] $ 7.87 $ 8.18
Options exercisable, weighted average remaining contractual term (Year) [1] 4 years 182 days 4 years 219 days
Options exercisable, aggregate intrinsic value [1],[2] $ 4,380 $ 13,980
Options exercisable and expected to be vested, shares (in shares) 223,200 212,333
Options exercisable and expected to be vested, weighted average exercise price (in dollars per share) $ 6.84 $ 7.72
Options exercisable and expected to be vested, weighted average remaining contractual term (Year) 4 years 255 days 4 years 219 days
Options exercisable and expected to be vested, aggregate intrinsic value [2] $ 4,380 $ 13,980
[1] Options with exercise prices ranging from $2.79 to $14.75
[2] The intrinsic value of a stock option is the amount by which the market value of the underlying stock exceeds the exercise price of the option.