Annual report pursuant to Section 13 and 15(d)

Options and Warrants (Details)

v2.4.1.9
Options and Warrants (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Class of Warrant or Right [Line Items]  
Number Outstanding 485,007us-gaap_ClassOfWarrantOrRightOutstanding
Remaining Contractual Life in Years 1 year 6 months
Number Currently Exercisable 485,007drne_ClassOfWarranTOrRightexercisableWarrantsOrRights
Weighted average exercise price $ 5.17us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
Warrant Issued In 2010 [Member]  
Class of Warrant or Right [Line Items]  
Number Outstanding 16,780us-gaap_ClassOfWarrantOrRightOutstanding
/ us-gaap_ClassOfWarrantOrRightAxis
= drne_WarrantIssuedIn2010Member
Remaining Contractual Life in Years 6 months
Number Currently Exercisable 16,780drne_ClassOfWarranTOrRightexercisableWarrantsOrRights
/ us-gaap_ClassOfWarrantOrRightAxis
= drne_WarrantIssuedIn2010Member
Weighted average exercise price $ 6.26us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_ClassOfWarrantOrRightAxis
= drne_WarrantIssuedIn2010Member
Warrant Issued In 2011 [Member]  
Class of Warrant or Right [Line Items]  
Number Outstanding 418,780us-gaap_ClassOfWarrantOrRightOutstanding
/ us-gaap_ClassOfWarrantOrRightAxis
= drne_WarrantIssuedIn2011Member
Remaining Contractual Life in Years 2 years
Number Currently Exercisable 418,780drne_ClassOfWarranTOrRightexercisableWarrantsOrRights
/ us-gaap_ClassOfWarrantOrRightAxis
= drne_WarrantIssuedIn2011Member
Weighted average exercise price $ 4.84us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_ClassOfWarrantOrRightAxis
= drne_WarrantIssuedIn2011Member
Warrant Issued In 2012 [Member]  
Class of Warrant or Right [Line Items]  
Number Outstanding 49,447us-gaap_ClassOfWarrantOrRightOutstanding
/ us-gaap_ClassOfWarrantOrRightAxis
= drne_WarrantIssuedIn2012Member
Remaining Contractual Life in Years 3 years
Number Currently Exercisable 49,447drne_ClassOfWarranTOrRightexercisableWarrantsOrRights
/ us-gaap_ClassOfWarrantOrRightAxis
= drne_WarrantIssuedIn2012Member
Weighted average exercise price $ 7.58us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_ClassOfWarrantOrRightAxis
= drne_WarrantIssuedIn2012Member