REVENUES - Revenue from External Customers by Products and Services (Details) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Revenue from External Customer [Line Items]
Revenues	$ 20,778,639	$ 27,248,509
Training and Simulation Division
Revenue from External Customer [Line Items]
Revenues	13,989,615	14,557,864
Training and Simulation Division | Air Warfare Simulation
Revenue from External Customer [Line Items]
Revenues	3,499,202	5,032,659
Training and Simulation Division | Vehicle Simulation
Revenue from External Customer [Line Items]
Revenues	7,080,941	5,463,998
Training and Simulation Division | Use-of-Force
Revenue from External Customer [Line Items]
Revenues	2,457,177	3,260,049
Training and Simulation Division | Warranty
Revenue from External Customer [Line Items]
Revenues	952,295	801,158
Power Systems Division
Revenue from External Customer [Line Items]
Revenues	6,789,024	12,690,645
Power Systems Division | Contract Manufacturing
Revenue from External Customer [Line Items]
Revenues	3,217,992	4,164,324
Power Systems Division | Power Distribution and Generation
Revenue from External Customer [Line Items]
Revenues	250,700	3,275,380
Power Systems Division | Batteries
Revenue from External Customer [Line Items]
Revenues	2,382,475	4,146,112
Power Systems Division | Engineering Services and Other
Revenue from External Customer [Line Items]
Revenues	$ 937,857	$ 1,104,829