XML 18 R54.htm IDEA: XBRL DOCUMENT v2.4.1.9
Stock Options (Schedule Of Stock Options Outstanding And Exercisable) (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted Average Exercise Price $ 0.57us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice $ 0.59us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice $ 0.61us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice $ 0.61us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
Options Outstanding 900,250us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber 870,250us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber 1,372,250us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber 1,471,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Options Exercisable 900,250us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber      
$0.50 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted Average Exercise Price $ 0.50us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_PlanNameAxis
= tgc_Plan4Member		      
Options Outstanding 400,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_PlanNameAxis
= tgc_Plan4Member		      
Weighted Average Remaining Contractual Life 9 months 18 days      
Options Exercisable 400,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber
/ us-gaap_PlanNameAxis
= tgc_Plan4Member		      
$0.43 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted Average Exercise Price $ 0.43us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_PlanNameAxis
= tgc_Plan5Member		      
Options Outstanding 50,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_PlanNameAxis
= tgc_Plan5Member		      
Weighted Average Remaining Contractual Life 1 month 6 days      
Options Exercisable 50,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber
/ us-gaap_PlanNameAxis
= tgc_Plan5Member		      
$0.44 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted Average Exercise Price $ 0.44us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_PlanNameAxis
= tgc_Plan6Member		      
Options Outstanding 94,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_PlanNameAxis
= tgc_Plan6Member		      
Weighted Average Remaining Contractual Life 8 months 12 days      
Options Exercisable 94,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber
/ us-gaap_PlanNameAxis
= tgc_Plan6Member		      
$1.08 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted Average Exercise Price $ 1.08us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_PlanNameAxis
= tgc_Plan7Member		      
Options Outstanding 50,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_PlanNameAxis
= tgc_Plan7Member		      
Weighted Average Remaining Contractual Life 1 year 3 months 18 days      
Options Exercisable 50,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber
/ us-gaap_PlanNameAxis
= tgc_Plan7Member		      
$1.16 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted Average Exercise Price $ 1.16us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_PlanNameAxis
= tgc_Plan8Member		      
Options Outstanding 18,750us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_PlanNameAxis
= tgc_Plan8Member		      
Weighted Average Remaining Contractual Life 1 year 3 months 18 days      
Options Exercisable 18,750us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber
/ us-gaap_PlanNameAxis
= tgc_Plan8Member		      
$0.84 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted Average Exercise Price $ 0.84us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_PlanNameAxis
= tgc_Plan9Member		      
Options Outstanding 18,750us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_PlanNameAxis
= tgc_Plan9Member		      
Weighted Average Remaining Contractual Life 1 year 6 months      
Options Exercisable 18,750us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber
/ us-gaap_PlanNameAxis
= tgc_Plan9Member		      
$0.72 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted Average Exercise Price $ 0.72us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_PlanNameAxis
= tgc_Plan10Member		      
Options Outstanding 18,750us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_PlanNameAxis
= tgc_Plan10Member		      
Weighted Average Remaining Contractual Life 1 year 9 months 18 days      
Options Exercisable 18,750us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber
/ us-gaap_PlanNameAxis
= tgc_Plan10Member		      
$0.75 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted Average Exercise Price $ 0.75us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_PlanNameAxis
= tgc_Plan11Member		      
Options Outstanding 18,750us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_PlanNameAxis
= tgc_Plan11Member		      
Weighted Average Remaining Contractual Life 2 years      
Options Exercisable 18,750us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber
/ us-gaap_PlanNameAxis
= tgc_Plan11Member		      
$1.07 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted Average Exercise Price $ 1.07us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_PlanNameAxis
= tgc_Plan12Member		      
Options Outstanding 18,750us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_PlanNameAxis
= tgc_Plan12Member		      
Weighted Average Remaining Contractual Life 2 years 3 months 18 days      
Options Exercisable 18,750us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber
/ us-gaap_PlanNameAxis
= tgc_Plan12Member		      
$0.81 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted Average Exercise Price $ 0.81us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_PlanNameAxis
= tgc_Plan13Member		      
Options Outstanding 18,750us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_PlanNameAxis
= tgc_Plan13Member		      
Weighted Average Remaining Contractual Life 2 years 6 months      
Options Exercisable 18,750us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber
/ us-gaap_PlanNameAxis
= tgc_Plan13Member		      
$0.73 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted Average Exercise Price $ 0.73us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_PlanNameAxis
= tgc_Plan14Member		      
Options Outstanding 18,750us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_PlanNameAxis
= tgc_Plan14Member		      
Weighted Average Remaining Contractual Life 2 years 9 months 18 days      
Options Exercisable 18,750us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber
/ us-gaap_PlanNameAxis
= tgc_Plan14Member		      
$0.64 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted Average Exercise Price $ 0.64us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_PlanNameAxis
= tgc_Plan15Member		      
Options Outstanding 18,750us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_PlanNameAxis
= tgc_Plan15Member		      
Weighted Average Remaining Contractual Life 3 years      
Options Exercisable 18,750us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber
/ us-gaap_PlanNameAxis
= tgc_Plan15Member		      
$0.62 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted Average Exercise Price $ 0.62us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_PlanNameAxis
= tgc_Plan16Member		      
Options Outstanding 18,750us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_PlanNameAxis
= tgc_Plan16Member		      
Weighted Average Remaining Contractual Life 3 years 2 months 12 days      
Options Exercisable 18,750us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber
/ us-gaap_PlanNameAxis
= tgc_Plan16Member		      
$0.48 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted Average Exercise Price $ 0.48us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_PlanNameAxis
= tgc_Plan17Member		      
Options Outstanding 18,750us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_PlanNameAxis
= tgc_Plan17Member		      
Weighted Average Remaining Contractual Life 3 years 6 months      
Options Exercisable 18,750us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber
/ us-gaap_PlanNameAxis
= tgc_Plan17Member		      
$0.41 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted Average Exercise Price $ 0.41us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_PlanNameAxis
= tgc_Plan18Member		      
Options Outstanding 18,750us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_PlanNameAxis
= tgc_Plan18Member		      
Weighted Average Remaining Contractual Life 3 years 9 months 18 days      
Options Exercisable 18,750us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber
/ us-gaap_PlanNameAxis
= tgc_Plan18Member		      
$0.41 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted Average Exercise Price $ 0.41us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_PlanNameAxis
= tgc_Plan19Member		      
Options Outstanding 25,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_PlanNameAxis
= tgc_Plan19Member		      
Weighted Average Remaining Contractual Life 4 years      
Options Exercisable 25,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber
/ us-gaap_PlanNameAxis
= tgc_Plan19Member		      
$0.48 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted Average Exercise Price $ 0.48us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_PlanNameAxis
= tgc_Plan20Member		      
Options Outstanding 25,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_PlanNameAxis
= tgc_Plan20Member		      
Weighted Average Remaining Contractual Life 4 years 2 months 12 days      
Options Exercisable 25,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber
/ us-gaap_PlanNameAxis
= tgc_Plan20Member		      
$0.44 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted Average Exercise Price $ 0.44us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_PlanNameAxis
= tgc_Plan21Member		      
Options Outstanding 25,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_PlanNameAxis
= tgc_Plan21Member		      
Weighted Average Remaining Contractual Life 4 years 6 months      
Options Exercisable 25,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber
/ us-gaap_PlanNameAxis
= tgc_Plan21Member		      
$0.44 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted Average Exercise Price $ 0.44us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_PlanNameAxis
= tgc_Plan22Member		      
Options Outstanding 25,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_PlanNameAxis
= tgc_Plan22Member		      
Weighted Average Remaining Contractual Life 4 years 9 months 18 days      
Options Exercisable 25,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber
/ us-gaap_PlanNameAxis
= tgc_Plan22Member