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CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)
 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Cash flows from operating activities:    
Net income $ 6,035,968 $ 3,099,886
Adjustments to reconcile net income to net cash used in operating activities:    
Depreciation and amortization 729,319 521,255
Debt issuance costs 67,479 58,990
Non-cash lease expense (84,036) (53,073)
Stock-based compensation 793,440 536,170
Common stock issued as employee compensation 32,324 45,913
Adjustment for maturity of interest rate swap   20,600
Bad debt expense   125,000
Deferred income taxes (784,635) 881,500
Changes in operating assets and liabilities:    
Increase in accounts receivable (1,661,439) (1,109,365)
Increase in contract assets (8,124,593) (2,009,154)
Increase in inventory (692,061) (95,268)
Decrease in refundable income taxes 435,000  
Decrease in prepaid expenses and other assets 797,622 177,625
Increase (decrease) in accounts payable and accrued expenses 890,672 (5,347,688)
(Decrease) increase in contract liabilities (2,359,976) 218,493
Decrease in other liabilities   (10,976)
Decrease in income taxes payable (115,000) (109,327)
Net cash used in operating activities (4,039,916) (3,049,419)
Cash flows from investing activities:    
Purchase of property and equipment (334,909) (521,499)
Net cash used in investing activities (334,909) (521,499)
Cash flows from financing activities:    
Payments on long-term debt (1,840,210) (1,522,283)
Proceeds from line of credit 3,000,000 6,200,000
Payments on line of credit (300,000) (1,500,000)
Stock offering costs paid (119,571)  
Debt issue costs paid (25,000) (209,082)
Net cash provided by financing activities 715,219 2,968,635
Net decrease in cash and restricted cash (3,659,606) (602,283)
Cash and restricted cash at beginning of period 6,128,142 1,430,877
Cash and restricted cash at end of period 2,468,536 828,594
Cash paid during the period for:    
Interest 1,406,581 1,601,144
Income taxes 103,927  
Noncash investing and financing activities:    
Equipment acquired under financing lease $ 399,800 $ 649,158