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Stock option activity (Details) {Stockholder Equity}
 3 Months Ended
Mar. 31, 2016
shares
Number of Options  
Outstanding 1,200,000
Exercisable 332,000
Forfeited 42,500
Granted 0
Expired 10,000
Outstanding 1,147,500
Exercisable 431,500
Weighted Average Exercise Price  
Outstanding 1.07
Exercisable 1.04
Forfeited 1.56
Expired 1.6
Outstanding 1
Exercisable 1.05
Contractual Life in Years  
Outstanding 5.19
Exercisable 3.34
Forfeited 8.42
Expired 8.8
Outstanding 4.57
Exercisable 3.24
Intrinsic Value  
Exercisable 28,000
Granted 0
Exercisable 13,515