Consolidated Balance Sheets - USD ($)	Dec. 31, 2017	Dec. 31, 2016
Current assets
Cash and cash equivalents	$ 3,390,000	$ 3,523,000
Investment securities, available-for-sale, at fair value	1,098,000	1,050,000
Accounts receivable, net
Trade - billed (less allowance for doubtful accounts of $208 and $347)	8,967,000	7,188,000
Trade - unbilled	251,000	271,000
Inventories, net
Raw materials	819,000	642,000
Finished goods	2,696,000	1,936,000
Prepaid expenses and other assets	452,000	371,000
Refundable income taxes	1,359,000	251,000
Total current assets	19,032,000	15,232,000
Property and equipment, net	9,867,000	8,007,000
Other assets	326,000	173,000
Total assets	29,225,000	23,412,000
Current liabilities
Accounts payable - trade	3,059,000	2,091,000
Accrued expenses and other liabilities	588,000	294,000
Deferred revenue	1,144,000	724,000
Accrued compensation	1,231,000	883,000
Dividend payable	256,000	49,000
Current maturities of notes payable	637,000	587,000
Customer deposits	919,000	431,000
Total current liabilities	7,834,000	5,059,000
Notes payable - less current maturities	2,896,000	3,346,000
Deferred tax liability	1,290,000	764,000
Total liabilities	12,020,000	9,169,000
Commitments and contingencies	0	0
Stockholders’ equity
Preferred stock, $.01 par value; authorized 1,000,000 shares, none issued and outstanding	0	0
Common stock, $.01 par value; authorized 8,000,000 shares; 5,214,148 and 5,085,348 issued and 5,047,895 and 4,941,428 outstanding, respectively	51,000	50,000
Additional paid-in capital	5,719,000	5,192,000
Treasury stock, at cost, 40,920 shares	(102,000)	(102,000)
Accumulated other comprehensive loss	(19,000)	(25,000)
Retained earnings	11,556,000	9,128,000
Total stockholders’ equity	17,205,000	14,243,000
Total liabilities and stockholders' equity	$ 29,225,000	$ 23,412,000