CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Cash flows provided by/(used in) operating activities:
Net income	$ 5,342,545	$ 11,004,241
Adjustments to reconcile net income to net cash provided by/(used in) operating activities:
Depreciation and amortization	2,503,291	1,218,559
Stock-based compensation	1,544,156	627,856
Loss on disposal of fixed assets	0	(1,000)
Gain on sale of discontinued operations, net of income taxes	0	(8,595,798)
Tax benefit from release of valuation allowance	(3,349,032)	0
Bad debt	538,298	6,000
Changes in operating assets and liabilities:
Accounts receivable	(2,248,925)	(6,240,377)
Contract assets	(448,891)	(761,714)
Inventory	(722,690)	(967,797)
Other assets	(242,112)	1,849,629
Other long-term assets	44,976	0
Accounts payable and accrued expenses	591,585	(461,927)
Contract liabilities	1,245,000	(986,498)
Net cash provided by/(used in) operating activities	4,798,201	(3,308,826)
Cash flows (used in)/provided by investing activities:
Acquisition of property and equipment	(540,635)	(386,890)
Proceeds from sale of property and equipment	0	1,000
Intangible property costs	(270,106)	(374,766)
Acquisition of Micron Optics, net	0	(5,001,750)
Acquisition of General Photonics Corporation, net	(19,004,250)	0
Proceeds from sale of discontinued operations, net	0	15,799,529
Net cash (used in)/provided by investing activities	(19,814,991)	10,037,123
Cash flows used in financing activities:
Payments on debt obligations	(625,000)	(1,833,333)
Payments on finance lease obligations	(40,047)	(46,653)
Purchase of treasury stock	(2,220,467)	(466,894)
Proceeds from the exercise of options and warrants	447,954	1,097,316
Net cash used in financing activities	(2,437,560)	(1,249,564)
Net change in cash and cash equivalents	(17,454,350)	5,478,733
Cash and cash equivalents—beginning of period	42,460,267	36,981,534
Cash and cash equivalents—end of period	25,005,917	42,460,267
Supplemental disclosure of cash flow information
Cash paid for interest	18,359	117,616
Cash paid for income taxes	1,160,276	1,828,203
Non-cash investing and financing activity:
Contingent liability for business combination	900,000	0
Common stock issued pursuant to restricted stock vesting	0	200,202
Dividend on preferred stock	$ 285,450	$ 257,302