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 ($)
 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Options exercisable and expected to be vested, weighted average remaining contractual term (Year) 4 years 182 days 4 years 219 days
Options exercisable and expected to be vested, aggregate intrinsic value [1] $ 13,080 $ 125,230
Options outstanding, shares (in shares) 247,200 218,000
Options outstanding, weighted average exercise price (in dollars per share) $ 6.69 $ 7.65
Options outstanding, weighted average exercise price (in dollars per share) [2] $ 6.84 $ 6.96
Options outstanding, weighted average remaining contractual term (Year) [2] 4 years 182 days 4 years 219 days
Options outstanding, aggregate intrinsic value [1],[2] $ 13,080 $ 134,102
Options exercisable, shares (in shares) [2] 180,534 181,533
Options exercisable, weighted average exercise price (in dollars per share) [2] $ 7.51 $ 8.18
Options exercisable, weighted average remaining contractual term (Year) [2] 4 years 109 days 4 years 146 days
Options exercisable, aggregate intrinsic value [1],[2] $ 13,080 $ 74,802
Options exercisable and expected to be vested, shares (in shares) 223,200 254,883
Options exercisable and expected to be vested, weighted average exercise price (in dollars per share) $ 6.84 $ 7.10
Options granted, shares (in shares) 6,000 50,000
Options granted, weighted average exercise price (in dollars per share) $ 3.79 $ 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) [2] 223,200 268,000
[1] The expected volatility is based on historical volatility from our traded Common Stock over the expected term of the option.
[2] The risk-free interest rate is based on the U.S. Treasury yield in effect at the grant date over the expected term of the option.