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CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Cash flows from operating activities:    
Net income $ 1,658,598 $ 1,256,765
Adjustments to reconcile net income to net cash used in operating activities:    
Depreciation and amortization 209,261 153,297
Debt issuance costs 20,024 21,392
Non-cash lease expense (28,012) (17,692)
Stock-based compensation 330,787 303,940
Common stock issued as employee compensation   45,913
Deferred income taxes (207,346) 405,000
Changes in operating assets and liabilities:    
Decrease in accounts receivable 2,040,174 1,395,407
Increase in contract assets (7,416,427) (2,865,025)
Increase in inventory (1,378,998) (49,100)
Decrease in refundable income taxes 435,000  
Decrease in prepaid expenses and other assets 558,845 98,683
Increase (decrease) in accounts payable and accrued expenses 1,993,200 (3,247,776)
(Decrease) increase in contract liabilities (686,782) 35,198
Increase (decrease) in income taxes payable 138,798 (109,327)
Net cash used in operating activities (2,332,878) (2,573,325)
Cash flows used in investing activities:    
Purchase of property and equipment (210,695) (156,006)
Net cash used in investing activities (210,695) (156,006)
Cash flows from financing activities:    
Payments on long-term debt (603,037) (418,306)
Proceeds from line of credit   2,000,000
Payments on line of credit (300,000)  
Stock offering costs paid (64,371)  
Net cash (used in) provided by financing activities (967,408) 1,581,694
Net decrease in cash and restricted cash (3,510,981) (1,147,637)
Cash and restricted cash at beginning of period 6,128,142 1,430,877
Cash and restricted cash at end of period 2,617,161 283,240
Cash paid during the period for:    
Interest 551,635 $ 429,614
Income taxes 90,202  
Equipment acquired under financing lease $ 399,800